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// Copyright (c) 2011 Novell, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
using Gtk;
using Gdk;
using System;
namespace GtkSamples {
public class ScribbleArea : DrawingArea {
public static int Main (string[] args)
{
Application.Init ();
Gtk.Window win = new Gtk.Window ("Scribble");
win.DeleteEvent += delegate { Application.Quit (); };
win.BorderWidth = 8;
Frame frm = new Frame (null);
frm.ShadowType = ShadowType.In;
frm.Add (new ScribbleArea ());
win.Add (frm);
win.ShowAll ();
Application.Run ();
return 0;
}
Cairo.Surface surface;
public ScribbleArea ()
{
SetSizeRequest (200, 200);
Events |= EventMask.ButtonPressMask | EventMask.PointerMotionMask | EventMask.PointerMotionHintMask;
}
void ClearSurface ()
{
using (Cairo.Context ctx = new Cairo.Context (surface)) {
ctx.SetSourceRGB (1, 1, 1);
ctx.Paint ();
}
}
void DrawBrush (double x, double y)
{
using (Cairo.Context ctx = new Cairo.Context (surface)) {
ctx.Rectangle ((int) x - 3, (int) y - 3, 6, 6);
ctx.Fill ();
}
QueueDrawArea ((int) x - 3, (int) y - 3, 6, 6);
}
protected override bool OnButtonPressEvent (EventButton ev)
{
if (surface == null)
return false;
switch (ev.Button) {
case 1:
DrawBrush (ev.X, ev.Y);
break;
case 3:
ClearSurface ();
QueueDraw ();
break;
default:
break;
}
return true;
}
protected override bool OnConfigureEvent (EventConfigure ev)
{
if (surface != null) {
surface.Dispose ();
}
surface = ev.Window.CreateSimilarSurface (Cairo.Content.Color, AllocatedWidth, AllocatedHeight);
ClearSurface ();
return true;
}
protected override bool OnDrawn (Cairo.Context ctx)
{
ctx.SetSourceSurface (surface, 0, 0);
ctx.Paint ();
return false;
}
protected override bool OnMotionNotifyEvent (EventMotion ev)
{
if (surface == null)
return false;
int x, y;
Gdk.ModifierType state;
ev.Window.GetPointer (out x, out y, out state);
if ((state & Gdk.ModifierType.Button1Mask) != 0)
DrawBrush (x, y);
return true;
}
}
}