Paint Owner-Draw Buttons : Button « GUI Windows Form « C# / C Sharp
Paint Owner-Draw Buttons
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
class OwnerDrawButtons: Form
{
readonly int cxImage, cyImage;
readonly int cxBtn, cyBtn, dxBtn;
readonly Button btnLarger, btnSmaller;
public static void Main()
{
Application.Run(new OwnerDrawButtons());
}
public OwnerDrawButtons()
{
ResizeRedraw = true;
cxImage = 4 * Font.Height;
cyImage = 4 * Font.Height;
cxBtn = cxImage + 8;
cyBtn = cyImage + 8;
dxBtn = Font.Height;
btnLarger = new Button();
btnLarger.Parent = this;
btnLarger.Size = new Size(cxBtn, cyBtn);
btnLarger.Click += new EventHandler(ButtonLargerOnClick);
btnLarger.Paint += new PaintEventHandler(ButtonOnPaint);
btnSmaller = new Button();
btnSmaller.Parent = this;
btnSmaller.Size = new Size(cxBtn, cyBtn);
btnSmaller.Click += new EventHandler(ButtonSmallerOnClick);
btnSmaller.Paint += new PaintEventHandler(ButtonOnPaint);
OnResize(EventArgs.Empty);
}
protected override void OnResize(EventArgs ea)
{
base.OnResize(ea);
btnLarger.Location =
new Point(ClientSize.Width / 2 - cxBtn - dxBtn / 2,
(ClientSize.Height - cyBtn) / 2);
btnSmaller.Location =
new Point(ClientSize.Width / 2 + dxBtn / 2,
(ClientSize.Height - cyBtn) / 2);
}
void ButtonLargerOnClick(object obj, EventArgs ea)
{
Console.WriteLine("clicked large");
}
void ButtonSmallerOnClick(object obj, EventArgs ea)
{
Console.WriteLine("clicked small");
}
void ButtonOnPaint(object obj, PaintEventArgs pea)
{
Button btn = (Button) obj;
Graphics grfx = pea.Graphics;
ControlPaint.DrawButton(grfx, 0, 0, cxBtn, cyBtn,
(btn == (Button) GetChildAtPoint(
PointToClient(
MousePosition))) &&
btn.Capture ? ButtonState.Pushed : ButtonState.Normal);
GraphicsState grfxstate = grfx.Save();
grfx.TranslateTransform((cxBtn - cxImage) / 2, (cyBtn - cyImage) / 2);
DrawLargerButton(grfx, cxImage, cyImage);
grfx.Restore(grfxstate);
if (btn.Focused)
ControlPaint.DrawFocusRectangle(grfx,
new Rectangle((cxBtn - cxImage) / 2 + cxImage / 16,
(cyBtn - cyImage) / 2 + cyImage / 16,
7 * cxImage / 8, 7 * cyImage / 8));
}
void DrawLargerButton(Graphics grfx, int cx, int cy)
{
Brush brush = new SolidBrush(btnLarger.ForeColor);
Pen pen = new Pen(btnLarger.ForeColor);
grfx.TranslateTransform(cx / 2, cy / 2);
for (int i = 0; i < 4; i++)
{
grfx.DrawLine(pen, 0, 0, cx / 4, 0);
grfx.FillPolygon(brush, new Point[] {
new Point(cx / 4, -cy / 8),
new Point(cx / 2, 0),
new Point(cx / 4, cy / 8)});
grfx.RotateTransform(90);
}
}
}
