| 1 | """An implementation of tabbed pages using only standard Tkinter.
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| 2 |
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| 3 | Originally developed for use in IDLE. Based on tabpage.py.
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| 4 |
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| 5 | Classes exported:
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| 6 | TabbedPageSet -- A Tkinter implementation of a tabbed-page widget.
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| 7 | TabSet -- A widget containing tabs (buttons) in one or more rows.
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| 8 |
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| 9 | """
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| 10 | from Tkinter import *
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| 11 |
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| 12 | class InvalidNameError(Exception): pass
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| 13 | class AlreadyExistsError(Exception): pass
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| 14 |
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| 15 |
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| 16 | class TabSet(Frame):
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| 17 | """A widget containing tabs (buttons) in one or more rows.
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| 18 |
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| 19 | Only one tab may be selected at a time.
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| 20 |
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| 21 | """
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| 22 | def __init__(self, page_set, select_command,
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| 23 | tabs=None, n_rows=1, max_tabs_per_row=5,
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| 24 | expand_tabs=False, **kw):
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| 25 | """Constructor arguments:
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| 26 |
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| 27 | select_command -- A callable which will be called when a tab is
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| 28 | selected. It is called with the name of the selected tab as an
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| 29 | argument.
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| 30 |
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| 31 | tabs -- A list of strings, the names of the tabs. Should be specified in
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| 32 | the desired tab order. The first tab will be the default and first
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| 33 | active tab. If tabs is None or empty, the TabSet will be initialized
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| 34 | empty.
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| 35 |
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| 36 | n_rows -- Number of rows of tabs to be shown. If n_rows <= 0 or is
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| 37 | None, then the number of rows will be decided by TabSet. See
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| 38 | _arrange_tabs() for details.
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| 39 |
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| 40 | max_tabs_per_row -- Used for deciding how many rows of tabs are needed,
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| 41 | when the number of rows is not constant. See _arrange_tabs() for
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| 42 | details.
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| 43 |
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| 44 | """
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| 45 | Frame.__init__(self, page_set, **kw)
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| 46 | self.select_command = select_command
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| 47 | self.n_rows = n_rows
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| 48 | self.max_tabs_per_row = max_tabs_per_row
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| 49 | self.expand_tabs = expand_tabs
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| 50 | self.page_set = page_set
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| 51 |
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| 52 | self._tabs = {}
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| 53 | self._tab2row = {}
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| 54 | if tabs:
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| 55 | self._tab_names = list(tabs)
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| 56 | else:
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| 57 | self._tab_names = []
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| 58 | self._selected_tab = None
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| 59 | self._tab_rows = []
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| 60 |
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| 61 | self.padding_frame = Frame(self, height=2,
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| 62 | borderwidth=0, relief=FLAT,
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| 63 | background=self.cget('background'))
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| 64 | self.padding_frame.pack(side=TOP, fill=X, expand=False)
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| 65 |
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| 66 | self._arrange_tabs()
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| 67 |
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| 68 | def add_tab(self, tab_name):
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| 69 | """Add a new tab with the name given in tab_name."""
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| 70 | if not tab_name:
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| 71 | raise InvalidNameError("Invalid Tab name: '%s'" % tab_name)
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| 72 | if tab_name in self._tab_names:
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| 73 | raise AlreadyExistsError("Tab named '%s' already exists" %tab_name)
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| 74 |
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| 75 | self._tab_names.append(tab_name)
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| 76 | self._arrange_tabs()
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| 77 |
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| 78 | def remove_tab(self, tab_name):
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| 79 | """Remove the tab named <tab_name>"""
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| 80 | if not tab_name in self._tab_names:
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| 81 | raise KeyError("No such Tab: '%s" % page_name)
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| 82 |
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| 83 | self._tab_names.remove(tab_name)
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| 84 | self._arrange_tabs()
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| 85 |
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| 86 | def set_selected_tab(self, tab_name):
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| 87 | """Show the tab named <tab_name> as the selected one"""
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| 88 | if tab_name == self._selected_tab:
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| 89 | return
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| 90 | if tab_name is not None and tab_name not in self._tabs:
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| 91 | raise KeyError("No such Tab: '%s" % page_name)
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| 92 |
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| 93 | # deselect the current selected tab
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| 94 | if self._selected_tab is not None:
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| 95 | self._tabs[self._selected_tab].set_normal()
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| 96 | self._selected_tab = None
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| 97 |
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| 98 | if tab_name is not None:
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| 99 | # activate the tab named tab_name
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| 100 | self._selected_tab = tab_name
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| 101 | tab = self._tabs[tab_name]
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| 102 | tab.set_selected()
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| 103 | # move the tab row with the selected tab to the bottom
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| 104 | tab_row = self._tab2row[tab]
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| 105 | tab_row.pack_forget()
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| 106 | tab_row.pack(side=TOP, fill=X, expand=0)
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| 107 |
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| 108 | def _add_tab_row(self, tab_names, expand_tabs):
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| 109 | if not tab_names:
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| 110 | return
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| 111 |
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| 112 | tab_row = Frame(self)
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| 113 | tab_row.pack(side=TOP, fill=X, expand=0)
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| 114 | self._tab_rows.append(tab_row)
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| 115 |
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| 116 | for tab_name in tab_names:
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| 117 | tab = TabSet.TabButton(tab_name, self.select_command,
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| 118 | tab_row, self)
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| 119 | if expand_tabs:
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| 120 | tab.pack(side=LEFT, fill=X, expand=True)
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| 121 | else:
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| 122 | tab.pack(side=LEFT)
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| 123 | self._tabs[tab_name] = tab
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| 124 | self._tab2row[tab] = tab_row
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| 125 |
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| 126 | # tab is the last one created in the above loop
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| 127 | tab.is_last_in_row = True
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| 128 |
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| 129 | def _reset_tab_rows(self):
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| 130 | while self._tab_rows:
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| 131 | tab_row = self._tab_rows.pop()
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| 132 | tab_row.destroy()
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| 133 | self._tab2row = {}
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| 134 |
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| 135 | def _arrange_tabs(self):
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| 136 | """
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| 137 | Arrange the tabs in rows, in the order in which they were added.
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| 138 |
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| 139 | If n_rows >= 1, this will be the number of rows used. Otherwise the
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| 140 | number of rows will be calculated according to the number of tabs and
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| 141 | max_tabs_per_row. In this case, the number of rows may change when
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| 142 | adding/removing tabs.
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| 143 |
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| 144 | """
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| 145 | # remove all tabs and rows
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| 146 | for tab_name in self._tabs.keys():
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| 147 | self._tabs.pop(tab_name).destroy()
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| 148 | self._reset_tab_rows()
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| 149 |
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| 150 | if not self._tab_names:
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| 151 | return
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| 152 |
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| 153 | if self.n_rows is not None and self.n_rows > 0:
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| 154 | n_rows = self.n_rows
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| 155 | else:
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| 156 | # calculate the required number of rows
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| 157 | n_rows = (len(self._tab_names) - 1) // self.max_tabs_per_row + 1
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| 158 |
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| 159 | # not expanding the tabs with more than one row is very ugly
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| 160 | expand_tabs = self.expand_tabs or n_rows > 1
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| 161 | i = 0 # index in self._tab_names
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| 162 | for row_index in xrange(n_rows):
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| 163 | # calculate required number of tabs in this row
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| 164 | n_tabs = (len(self._tab_names) - i - 1) // (n_rows - row_index) + 1
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| 165 | tab_names = self._tab_names[i:i + n_tabs]
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| 166 | i += n_tabs
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| 167 | self._add_tab_row(tab_names, expand_tabs)
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| 168 |
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| 169 | # re-select selected tab so it is properly displayed
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| 170 | selected = self._selected_tab
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| 171 | self.set_selected_tab(None)
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| 172 | if selected in self._tab_names:
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| 173 | self.set_selected_tab(selected)
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| 174 |
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| 175 | class TabButton(Frame):
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| 176 | """A simple tab-like widget."""
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| 177 |
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| 178 | bw = 2 # borderwidth
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| 179 |
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| 180 | def __init__(self, name, select_command, tab_row, tab_set):
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| 181 | """Constructor arguments:
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| 182 |
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| 183 | name -- The tab's name, which will appear in its button.
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| 184 |
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| 185 | select_command -- The command to be called upon selection of the
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| 186 | tab. It is called with the tab's name as an argument.
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| 187 |
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| 188 | """
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| 189 | Frame.__init__(self, tab_row, borderwidth=self.bw, relief=RAISED)
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| 190 |
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| 191 | self.name = name
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| 192 | self.select_command = select_command
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| 193 | self.tab_set = tab_set
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| 194 | self.is_last_in_row = False
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| 195 |
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| 196 | self.button = Radiobutton(
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| 197 | self, text=name, command=self._select_event,
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| 198 | padx=5, pady=1, takefocus=FALSE, indicatoron=FALSE,
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| 199 | highlightthickness=0, selectcolor='', borderwidth=0)
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| 200 | self.button.pack(side=LEFT, fill=X, expand=True)
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| 201 |
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| 202 | self._init_masks()
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| 203 | self.set_normal()
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| 204 |
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| 205 | def _select_event(self, *args):
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| 206 | """Event handler for tab selection.
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| 207 |
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| 208 | With TabbedPageSet, this calls TabbedPageSet.change_page, so that
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| 209 | selecting a tab changes the page.
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| 210 |
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| 211 | Note that this does -not- call set_selected -- it will be called by
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| 212 | TabSet.set_selected_tab, which should be called when whatever the
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| 213 | tabs are related to changes.
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| 214 |
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| 215 | """
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| 216 | self.select_command(self.name)
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| 217 | return
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| 218 |
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| 219 | def set_selected(self):
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| 220 | """Assume selected look"""
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| 221 | self._place_masks(selected=True)
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| 222 |
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| 223 | def set_normal(self):
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| 224 | """Assume normal look"""
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| 225 | self._place_masks(selected=False)
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| 226 |
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| 227 | def _init_masks(self):
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| 228 | page_set = self.tab_set.page_set
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| 229 | background = page_set.pages_frame.cget('background')
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| 230 | # mask replaces the middle of the border with the background color
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| 231 | self.mask = Frame(page_set, borderwidth=0, relief=FLAT,
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| 232 | background=background)
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| 233 | # mskl replaces the bottom-left corner of the border with a normal
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| 234 | # left border
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| 235 | self.mskl = Frame(page_set, borderwidth=0, relief=FLAT,
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| 236 | background=background)
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| 237 | self.mskl.ml = Frame(self.mskl, borderwidth=self.bw,
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| 238 | relief=RAISED)
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| 239 | self.mskl.ml.place(x=0, y=-self.bw,
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| 240 | width=2*self.bw, height=self.bw*4)
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| 241 | # mskr replaces the bottom-right corner of the border with a normal
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| 242 | # right border
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| 243 | self.mskr = Frame(page_set, borderwidth=0, relief=FLAT,
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| 244 | background=background)
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| 245 | self.mskr.mr = Frame(self.mskr, borderwidth=self.bw,
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| 246 | relief=RAISED)
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| 247 |
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| 248 | def _place_masks(self, selected=False):
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| 249 | height = self.bw
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| 250 | if selected:
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| 251 | height += self.bw
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| 252 |
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| 253 | self.mask.place(in_=self,
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| 254 | relx=0.0, x=0,
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| 255 | rely=1.0, y=0,
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| 256 | relwidth=1.0, width=0,
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| 257 | relheight=0.0, height=height)
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| 258 |
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| 259 | self.mskl.place(in_=self,
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| 260 | relx=0.0, x=-self.bw,
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| 261 | rely=1.0, y=0,
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| 262 | relwidth=0.0, width=self.bw,
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| 263 | relheight=0.0, height=height)
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| 264 |
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| 265 | page_set = self.tab_set.page_set
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| 266 | if selected and ((not self.is_last_in_row) or
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| 267 | (self.winfo_rootx() + self.winfo_width() <
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| 268 | page_set.winfo_rootx() + page_set.winfo_width())
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| 269 | ):
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| 270 | # for a selected tab, if its rightmost edge isn't on the
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| 271 | # rightmost edge of the page set, the right mask should be one
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| 272 | # borderwidth shorter (vertically)
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| 273 | height -= self.bw
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| 274 |
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| 275 | self.mskr.place(in_=self,
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| 276 | relx=1.0, x=0,
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| 277 | rely=1.0, y=0,
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| 278 | relwidth=0.0, width=self.bw,
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| 279 | relheight=0.0, height=height)
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| 280 |
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| 281 | self.mskr.mr.place(x=-self.bw, y=-self.bw,
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| 282 | width=2*self.bw, height=height + self.bw*2)
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| 283 |
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| 284 | # finally, lower the tab set so that all of the frames we just
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| 285 | # placed hide it
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| 286 | self.tab_set.lower()
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| 287 |
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| 288 | class TabbedPageSet(Frame):
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| 289 | """A Tkinter tabbed-pane widget.
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| 290 |
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| 291 | Constains set of 'pages' (or 'panes') with tabs above for selecting which
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| 292 | page is displayed. Only one page will be displayed at a time.
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| 293 |
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| 294 | Pages may be accessed through the 'pages' attribute, which is a dictionary
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| 295 | of pages, using the name given as the key. A page is an instance of a
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| 296 | subclass of Tk's Frame widget.
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| 297 |
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| 298 | The page widgets will be created (and destroyed when required) by the
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| 299 | TabbedPageSet. Do not call the page's pack/place/grid/destroy methods.
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| 300 |
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| 301 | Pages may be added or removed at any time using the add_page() and
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| 302 | remove_page() methods.
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| 303 |
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| 304 | """
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| 305 | class Page(object):
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| 306 | """Abstract base class for TabbedPageSet's pages.
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| 307 |
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| 308 | Subclasses must override the _show() and _hide() methods.
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| 309 |
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| 310 | """
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| 311 | uses_grid = False
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| 312 |
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| 313 | def __init__(self, page_set):
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| 314 | self.frame = Frame(page_set, borderwidth=2, relief=RAISED)
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| 315 |
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| 316 | def _show(self):
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| 317 | raise NotImplementedError
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| 318 |
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| 319 | def _hide(self):
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| 320 | raise NotImplementedError
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| 321 |
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| 322 | class PageRemove(Page):
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| 323 | """Page class using the grid placement manager's "remove" mechanism."""
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| 324 | uses_grid = True
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| 325 |
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| 326 | def _show(self):
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| 327 | self.frame.grid(row=0, column=0, sticky=NSEW)
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| 328 |
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| 329 | def _hide(self):
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| 330 | self.frame.grid_remove()
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| 331 |
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| 332 | class PageLift(Page):
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| 333 | """Page class using the grid placement manager's "lift" mechanism."""
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| 334 | uses_grid = True
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| 335 |
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| 336 | def __init__(self, page_set):
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| 337 | super(TabbedPageSet.PageLift, self).__init__(page_set)
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| 338 | self.frame.grid(row=0, column=0, sticky=NSEW)
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| 339 | self.frame.lower()
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| 340 |
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| 341 | def _show(self):
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| 342 | self.frame.lift()
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| 343 |
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| 344 | def _hide(self):
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| 345 | self.frame.lower()
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| 346 |
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| 347 | class PagePackForget(Page):
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| 348 | """Page class using the pack placement manager's "forget" mechanism."""
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| 349 | def _show(self):
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| 350 | self.frame.pack(fill=BOTH, expand=True)
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| 351 |
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| 352 | def _hide(self):
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| 353 | self.frame.pack_forget()
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| 354 |
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| 355 | def __init__(self, parent, page_names=None, page_class=PageLift,
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| 356 | n_rows=1, max_tabs_per_row=5, expand_tabs=False,
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| 357 | **kw):
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| 358 | """Constructor arguments:
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| 359 |
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| 360 | page_names -- A list of strings, each will be the dictionary key to a
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| 361 | page's widget, and the name displayed on the page's tab. Should be
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| 362 | specified in the desired page order. The first page will be the default
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| 363 | and first active page. If page_names is None or empty, the
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| 364 | TabbedPageSet will be initialized empty.
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| 365 |
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| 366 | n_rows, max_tabs_per_row -- Parameters for the TabSet which will
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| 367 | manage the tabs. See TabSet's docs for details.
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| 368 |
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| 369 | page_class -- Pages can be shown/hidden using three mechanisms:
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| 370 |
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| 371 | * PageLift - All pages will be rendered one on top of the other. When
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| 372 | a page is selected, it will be brought to the top, thus hiding all
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| 373 | other pages. Using this method, the TabbedPageSet will not be resized
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| 374 | when pages are switched. (It may still be resized when pages are
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| 375 | added/removed.)
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| 376 |
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| 377 | * PageRemove - When a page is selected, the currently showing page is
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| 378 | hidden, and the new page shown in its place. Using this method, the
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| 379 | TabbedPageSet may resize when pages are changed.
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| 380 |
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| 381 | * PagePackForget - This mechanism uses the pack placement manager.
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| 382 | When a page is shown it is packed, and when it is hidden it is
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| 383 | unpacked (i.e. pack_forget). This mechanism may also cause the
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| 384 | TabbedPageSet to resize when the page is changed.
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| 385 |
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| 386 | """
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| 387 | Frame.__init__(self, parent, **kw)
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| 388 |
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| 389 | self.page_class = page_class
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| 390 | self.pages = {}
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| 391 | self._pages_order = []
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| 392 | self._current_page = None
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| 393 | self._default_page = None
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| 394 |
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| 395 | self.columnconfigure(0, weight=1)
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| 396 | self.rowconfigure(1, weight=1)
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| 397 |
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| 398 | self.pages_frame = Frame(self)
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| 399 | self.pages_frame.grid(row=1, column=0, sticky=NSEW)
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| 400 | if self.page_class.uses_grid:
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| 401 | self.pages_frame.columnconfigure(0, weight=1)
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| 402 | self.pages_frame.rowconfigure(0, weight=1)
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| 403 |
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| 404 | # the order of the following commands is important
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| 405 | self._tab_set = TabSet(self, self.change_page, n_rows=n_rows,
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| 406 | max_tabs_per_row=max_tabs_per_row,
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| 407 | expand_tabs=expand_tabs)
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| 408 | if page_names:
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| 409 | for name in page_names:
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| 410 | self.add_page(name)
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| 411 | self._tab_set.grid(row=0, column=0, sticky=NSEW)
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| 412 |
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| 413 | self.change_page(self._default_page)
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| 414 |
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| 415 | def add_page(self, page_name):
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| 416 | """Add a new page with the name given in page_name."""
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| 417 | if not page_name:
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| 418 | raise InvalidNameError("Invalid TabPage name: '%s'" % page_name)
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| 419 | if page_name in self.pages:
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| 420 | raise AlreadyExistsError(
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| 421 | "TabPage named '%s' already exists" % page_name)
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| 422 |
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| 423 | self.pages[page_name] = self.page_class(self.pages_frame)
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| 424 | self._pages_order.append(page_name)
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| 425 | self._tab_set.add_tab(page_name)
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| 426 |
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| 427 | if len(self.pages) == 1: # adding first page
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| 428 | self._default_page = page_name
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| 429 | self.change_page(page_name)
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| 430 |
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| 431 | def remove_page(self, page_name):
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| 432 | """Destroy the page whose name is given in page_name."""
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| 433 | if not page_name in self.pages:
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| 434 | raise KeyError("No such TabPage: '%s" % page_name)
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| 435 |
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| 436 | self._pages_order.remove(page_name)
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| 437 |
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| 438 | # handle removing last remaining, default, or currently shown page
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| 439 | if len(self._pages_order) > 0:
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| 440 | if page_name == self._default_page:
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| 441 | # set a new default page
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| 442 | self._default_page = self._pages_order[0]
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| 443 | else:
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| 444 | self._default_page = None
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| 445 |
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| 446 | if page_name == self._current_page:
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| 447 | self.change_page(self._default_page)
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| 448 |
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| 449 | self._tab_set.remove_tab(page_name)
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| 450 | page = self.pages.pop(page_name)
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| 451 | page.frame.destroy()
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| 452 |
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| 453 | def change_page(self, page_name):
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| 454 | """Show the page whose name is given in page_name."""
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| 455 | if self._current_page == page_name:
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| 456 | return
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| 457 | if page_name is not None and page_name not in self.pages:
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| 458 | raise KeyError("No such TabPage: '%s'" % page_name)
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| 459 |
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|---|
| 460 | if self._current_page is not None:
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| 461 | self.pages[self._current_page]._hide()
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| 462 | self._current_page = None
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| 463 |
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| 464 | if page_name is not None:
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| 465 | self._current_page = page_name
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| 466 | self.pages[page_name]._show()
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| 467 |
|
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| 468 | self._tab_set.set_selected_tab(page_name)
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| 469 |
|
|---|
| 470 | if __name__ == '__main__':
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|---|
| 471 | # test dialog
|
|---|
| 472 | root=Tk()
|
|---|
| 473 | tabPage=TabbedPageSet(root, page_names=['Foobar','Baz'], n_rows=0,
|
|---|
| 474 | expand_tabs=False,
|
|---|
| 475 | )
|
|---|
| 476 | tabPage.pack(side=TOP, expand=TRUE, fill=BOTH)
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|---|
| 477 | Label(tabPage.pages['Foobar'].frame, text='Foo', pady=20).pack()
|
|---|
| 478 | Label(tabPage.pages['Foobar'].frame, text='Bar', pady=20).pack()
|
|---|
| 479 | Label(tabPage.pages['Baz'].frame, text='Baz').pack()
|
|---|
| 480 | entryPgName=Entry(root)
|
|---|
| 481 | buttonAdd=Button(root, text='Add Page',
|
|---|
| 482 | command=lambda:tabPage.add_page(entryPgName.get()))
|
|---|
| 483 | buttonRemove=Button(root, text='Remove Page',
|
|---|
| 484 | command=lambda:tabPage.remove_page(entryPgName.get()))
|
|---|
| 485 | labelPgName=Label(root, text='name of page to add/remove:')
|
|---|
| 486 | buttonAdd.pack(padx=5, pady=5)
|
|---|
| 487 | buttonRemove.pack(padx=5, pady=5)
|
|---|
| 488 | labelPgName.pack(padx=5)
|
|---|
| 489 | entryPgName.pack(padx=5)
|
|---|
| 490 | root.mainloop()
|
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