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b2931f22c3
The drawing area is automatically cleared to the background color, so we don't need a Drawn callback to do it ourselves. Preserve the color selected in the color selection dialog, so that it's pre-selected the next time the dialog is opened.
77 lines
2 KiB
C#
77 lines
2 KiB
C#
/* Color Selector
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*
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* GtkColorSelection lets the user choose a color. GtkColorSelectionDialog is
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* a prebuilt dialog containing a GtkColorSelection.
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*
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*/
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using System;
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using Gdk;
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using Gtk;
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namespace GtkDemo
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{
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[Demo ("Color Selection", "DemoColorSelection.cs")]
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public class DemoColorSelection : Gtk.Window
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{
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private Gdk.RGBA color;
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private Gtk.DrawingArea drawingArea;
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public DemoColorSelection () : base ("Color Selection")
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{
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BorderWidth = 8;
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VBox vbox = new VBox (false,8);
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vbox.BorderWidth = 8;
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Add (vbox);
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// Create the color swatch area
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Frame frame = new Frame ();
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frame.ShadowType = ShadowType.In;
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vbox.PackStart (frame, true, true, 0);
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drawingArea = new DrawingArea ();
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// set a minimum size
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drawingArea.SetSizeRequest (200,200);
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// set the color
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color.Red = 0;
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color.Green = 0;
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color.Blue = 1;
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color.Alpha = 1;
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drawingArea.OverrideBackgroundColor (StateFlags.Normal, color);
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frame.Add (drawingArea);
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Alignment alignment = new Alignment (1.0f, 0.5f, 0.0f, 0.0f);
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Button button = new Button ("_Change the above color");
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button.Clicked += new EventHandler (ChangeColorCallback);
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alignment.Add (button);
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vbox.PackStart (alignment, false, false, 0);
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ShowAll ();
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}
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protected override bool OnDeleteEvent (Gdk.Event evt)
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{
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Destroy ();
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return true;
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}
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private void ChangeColorCallback (object o, EventArgs args)
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{
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using (ColorSelectionDialog colorSelectionDialog = new ColorSelectionDialog ("Changing color")) {
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colorSelectionDialog.TransientFor = this;
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colorSelectionDialog.ColorSelection.SetPreviousRgba (color);
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colorSelectionDialog.ColorSelection.CurrentRgba = color;
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colorSelectionDialog.ColorSelection.HasPalette = true;
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if (colorSelectionDialog.Run () == (int) ResponseType.Ok) {
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color = colorSelectionDialog.ColorSelection.CurrentRgba;
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drawingArea.OverrideBackgroundColor (StateFlags.Normal, color);
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}
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colorSelectionDialog.Hide ();
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}
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}
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}
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}
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