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/* Color Selector
*
* GtkColorSelection lets the user choose a color. GtkColorSelectionDialog is
* a prebuilt dialog containing a GtkColorSelection.
*
*/
using System;
using Gdk;
using Gtk;
namespace GtkDemo
{
[Demo ("Color Selection", "DemoColorSelection.cs")]
public class DemoColorSelection : Gtk.Window
{
private Gdk.Color color;
private Gtk.DrawingArea drawingArea;
public DemoColorSelection () : base ("Color Selection")
{
BorderWidth = 8;
VBox vbox = new VBox (false,8);
vbox.BorderWidth = 8;
Add (vbox);
// Create the color swatch area
Frame frame = new Frame ();
frame.ShadowType = ShadowType.In;
vbox.PackStart (frame, true, true, 0);
drawingArea = new DrawingArea ();
drawingArea.ExposeEvent += new ExposeEventHandler (ExposeEventCallback);
// set a minimum size
drawingArea.SetSizeRequest (200,200);
// set the color
color = new Gdk.Color (0, 0, 0xff);
drawingArea.ModifyBg (StateType.Normal, color);
frame.Add (drawingArea);
Alignment alignment = new Alignment (1.0f, 0.5f, 0.0f, 0.0f);
Button button = new Button ("_Change the above color");
button.Clicked += new EventHandler (ChangeColorCallback);
alignment.Add (button);
vbox.PackStart (alignment);
ShowAll ();
}
protected override bool OnDeleteEvent (Gdk.Event evt)
{
Destroy ();
return true;
}
// Expose callback for the drawing area
private void ExposeEventCallback (object o, ExposeEventArgs args)
{
EventExpose eventExpose = args.Event;
Gdk.Window window = eventExpose.Window;
Rectangle area = eventExpose.Area;
window.DrawRectangle (drawingArea.Style.BackgroundGC (StateType.Normal),
true,
area.X, area.Y,
area.Width, area.Height);
args.RetVal = true;
}
private void ChangeColorCallback (object o, EventArgs args)
{
using (ColorSelectionDialog colorSelectionDialog = new ColorSelectionDialog ("Changing color")) {
colorSelectionDialog.TransientFor = this;
colorSelectionDialog.ColorSelection.PreviousColor = color;
colorSelectionDialog.ColorSelection.CurrentColor = color;
colorSelectionDialog.ColorSelection.HasPalette = true;
if (colorSelectionDialog.Run () == (int) ResponseType.Ok) {
Gdk.Color selected = colorSelectionDialog.ColorSelection.CurrentColor;
drawingArea.ModifyBg (StateType.Normal, selected);
}
colorSelectionDialog.Hide ();
}
}
}
}
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