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Viewing changes to external/xwt/Samples/Samples/ScrollWindowSample.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/xwt/Samples/Samples/ScrollWindowSample.cs
 
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// 
 
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// ScrollWindowSample.cs
 
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//  
 
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// Author:
 
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//       Lluis Sanchez <lluis@xamarin.com>
 
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// 
 
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// Copyright (c) 2011 Xamarin Inc
 
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// 
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
 
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// of this software and associated documentation files (the "Software"), to deal
 
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// in the Software without restriction, including without limitation the rights
 
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
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// copies of the Software, and to permit persons to whom the Software is
 
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// furnished to do so, subject to the following conditions:
 
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// 
 
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// The above copyright notice and this permission notice shall be included in
 
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// all copies or substantial portions of the Software.
 
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// 
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
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// THE SOFTWARE.
 
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using System;
 
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using Xwt;
 
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using Xwt.Drawing;
 
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namespace Samples
 
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{
 
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        public class ScrollWindowSample: VBox
 
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        {
 
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                public ScrollWindowSample ()
 
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                {
 
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                        ScrollView v1 = new ScrollView ();
 
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                        VBox b1 = new VBox ();
 
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                        for (int n=0; n<30; n++)
 
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                                b1.PackStart (new Label ("Line " + n), BoxMode.None);
 
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                        Button u = new Button ("Click to remove");
 
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                        u.Clicked += delegate {
 
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                                b1.Remove (u);
 
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                        };
 
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                        b1.PackStart (u);
 
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                        v1.Content = b1;
 
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                        v1.VerticalScrollPolicy = ScrollPolicy.Always;
 
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                        v1.BorderVisible = false;
 
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                        PackStart (v1, BoxMode.FillAndExpand);
 
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                        ScrollView v2 = new ScrollView ();
 
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                        VBox b2 = new VBox ();
 
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                        for (int n=0; n<10; n++)
 
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                                b2.PackStart (new Label ("Line " + n), BoxMode.None);
 
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                        v2.Content = b2;
 
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                        v2.VerticalScrollPolicy = ScrollPolicy.Never;
 
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                        PackStart (v2, BoxMode.FillAndExpand);
 
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                        ScrollView v3 = new ScrollView ();
 
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                        VBox b3 = new VBox ();
 
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                        Button b = new Button ("Click to add items");
 
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                        b.Clicked += delegate {
 
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                                for (int n=0; n<10; n++)
 
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                                        b3.PackStart (new Label ("Line " + n), BoxMode.None);
 
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                        };
 
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                        b3.PackStart (b);
 
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                        v3.Content = b3;
 
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                        v3.VerticalScrollPolicy = ScrollPolicy.Automatic;
 
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                        PackStart (v3, BoxMode.FillAndExpand);
 
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                        ScrollView v4 = new ScrollView ();
 
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                        PackStart (v4, BoxMode.FillAndExpand);
 
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                        var sb = new ScrollableCanvas ();
 
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                        v4.Content = sb;
 
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                        v4.VerticalScrollPolicy = ScrollPolicy.Always;
 
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                }
 
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        }
 
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        class ScrollableCanvas: Canvas
 
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        {
 
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                ScrollAdjustment hscroll;
 
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                ScrollAdjustment vscroll;
 
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                int imageSize = 500;
 
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                public ScrollableCanvas ()
 
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                {
 
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                        MinWidth = 100;
 
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                        MinHeight = 100;
 
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                }
 
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                protected override void OnDraw (Context ctx, Rectangle dirtyRect)
 
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                {
 
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                        ctx.Save ();
 
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                        ctx.Translate (-hscroll.Value, -vscroll.Value);
 
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                        ctx.Rectangle (new Rectangle (0, 0, imageSize, imageSize));
 
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                        ctx.SetColor (Xwt.Drawing.Colors.White);
 
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                        ctx.Fill ();
 
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                        ctx.Arc (imageSize / 2, imageSize / 2, imageSize / 2 - 20, 0, 360);
 
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                        ctx.SetColor (new Color (0,0,1));
 
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                        ctx.Fill ();
 
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                        ctx.Restore ();
 
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                        ctx.Rectangle (0, 0, Bounds.Width, 30);
 
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                        ctx.SetColor (new Color (1, 0, 0, 0.5));
 
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                        ctx.Fill ();
 
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                }
 
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                protected override bool SupportsCustomScrolling {
 
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                        get {
 
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                                return true;
 
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                        }
 
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                }
 
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                protected override void SetScrollAdjustments (ScrollAdjustment horizontal, ScrollAdjustment vertical)
 
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                {
 
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                        hscroll = horizontal;
 
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                        vscroll = vertical;
 
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                        hscroll.UpperValue = imageSize;
 
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                        hscroll.PageIncrement = Bounds.Width;
 
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                        hscroll.PageSize = Bounds.Width;
 
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                        hscroll.ValueChanged += delegate {
 
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                                QueueDraw ();
 
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                        };
 
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                        vscroll.UpperValue = imageSize;
 
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                        vscroll.PageIncrement = Bounds.Height;
 
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                        vscroll.PageSize = Bounds.Height;
 
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                        vscroll.ValueChanged += delegate {
 
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                                QueueDraw ();
 
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                        };
 
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                }
 
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                protected override void OnBoundsChanged ()
 
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                {
 
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                        vscroll.PageSize = vscroll.PageIncrement = Bounds.Height;
 
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                        hscroll.PageSize = hscroll.PageIncrement = Bounds.Width;
 
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                }
 
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        }
 
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}
 
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