Changeset 112 for trunk/src/gui/kernel/qwidget_pm.cpp

Timestamp:

Aug 14, 2009, 5:13:16 PM (16 years ago)

Author:

Dmitry A. Kuminov

Message:

gui: Paint event translation.

File:

• trunk/src/gui/kernel/qwidget_pm.cpp (modified) (2 diffs)

trunk/src/gui/kernel/qwidget_pm.cpp

@@ -1467 +1467 @@
     fs.setCoords(cswp.x, cswp.y, swp.cx - cswp.x - cswp.cx,
                                  swp.cy - cswp.y - cswp.cy);
-    // @todo need this??
+    // @todo do we really need to update crect here??
     //data.crect.setRect(swp.x + cswp.x, swp.y + cswp.y, cswp.cx, cswp.cy);
 
@@ -1480 +1480 @@
 QPaintEngine *QWidget::paintEngine() const
 {
-    // @todo implement
+    // @todo this is a place to return some direct on-screen PaintEngine once
+    // we decide to support it
+
+    // We set this bit which is checked in setAttribute for
+    // Qt::WA_PaintOnScreen. We do this to allow these two scenarios:
+    //
+    // 1. Users accidentally set Qt::WA_PaintOnScreen on X and port to
+    // OS/2 which would mean suddenly their widgets stop working.
+    //
+    // 2. Users set paint on screen and subclass paintEngine() to
+    // return 0, in which case we have a "hole" in the backingstore
+    // allowing use of GPI directly.
+    //
+    // 1 is WRONG, but to minimize silent failures, we have set this
+    // bit to ignore the setAttribute call. 2. needs to be
+    // supported because its our only means of embeddeding native
+    // graphics stuff.
+    const_cast<QWidgetPrivate *>(d_func())->noPaintOnScreen = 1;
+
     return 0;
 }