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![Bertrand Lorentz](/assets/img/avatar_default.png)
Make the custom widget a generic class, and add and use a derived class. Also add a second instance of the custom widget, to better test the interface properties support.
211 lines
4.7 KiB
C#
211 lines
4.7 KiB
C#
using GLib;
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using Gtk;
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using System;
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class CustomScrollableWidgetTest {
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public static int Main (string[] args)
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{
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Gtk.Application.Init ();
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Window win = new Window ("Custom Scrollable Widget Test");
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win.DeleteEvent += new DeleteEventHandler (OnQuit);
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VPaned paned = new VPaned ();
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ScrolledWindow scroll = new ScrolledWindow ();
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scroll.HscrollbarPolicy = PolicyType.Automatic;
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scroll.VscrollbarPolicy = PolicyType.Automatic;
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var cw = new DerivedScrollableWidget<string> ("This one label that is repeated");
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scroll.Add (cw);
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paned.Pack1 (scroll, true, false);
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scroll = new ScrolledWindow ();
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scroll.HscrollbarPolicy = PolicyType.Automatic;
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scroll.VscrollbarPolicy = PolicyType.Automatic;
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var cw2 = new DerivedScrollableWidget<object> ("Another label that is repeated");
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scroll.Add (cw2);
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paned.Pack2 (scroll, true, false);
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win.Add (paned);
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win.DefaultWidth = 200;
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win.DefaultHeight = 200;
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win.ShowAll ();
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Gtk.Application.Run ();
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return 0;
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}
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static void OnQuit (object sender, DeleteEventArgs args)
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{
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Gtk.Application.Quit ();
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}
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}
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abstract class CustomBase : Widget
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{
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public CustomBase () : base ()
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{ }
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}
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class DerivedScrollableWidget<T> : CustomScrollableWidget<T>
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{
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public DerivedScrollableWidget (string label) : base (label)
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{ }
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}
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class CustomScrollableWidget<T> : CustomBase, ScrollableImplementor {
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private int num_rows = 20;
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private string label;
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private Pango.Layout layout;
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public CustomScrollableWidget (string custom_label) : base ()
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{
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label = custom_label;
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layout = null;
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HasWindow = false;
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}
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private Pango.Layout Layout {
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get {
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if (layout == null)
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layout = CreatePangoLayout (label);
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return layout;
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}
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}
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private Gdk.Rectangle ContentArea {
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get {
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Gdk.Rectangle area;
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area.X = Allocation.X;
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area.Y = Allocation.Y;
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int layoutWidth, layoutHeight;
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Layout.GetPixelSize (out layoutWidth, out layoutHeight);
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area.Width = layoutWidth;
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area.Height = layoutHeight * num_rows;
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return area;
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}
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}
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protected override bool OnDrawn (Cairo.Context cr)
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{
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int layout_x = - HadjustmentValue;
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int layout_y = - VadjustmentValue;
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int layoutWidth, layoutHeight;
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Layout.GetPixelSize (out layoutWidth, out layoutHeight);
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for (int i = 0; i < num_rows; i++) {
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Layout.SetText (String.Format ("{0} {1}", label, i));
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StyleContext.RenderLayout (cr, layout_x, layout_y, Layout);
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layout_y += layoutHeight;
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}
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return base.OnDrawn (cr);
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}
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protected override void OnSizeAllocated (Gdk.Rectangle allocation)
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{
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base.OnSizeAllocated (allocation);
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if (hadjustment != null) {
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hadjustment.PageSize = allocation.Width;
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hadjustment.PageIncrement = allocation.Width;
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UpdateAdjustments ();
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}
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if (vadjustment != null) {
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vadjustment.PageSize = allocation.Height;
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vadjustment.PageIncrement = allocation.Height;
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UpdateAdjustments ();
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}
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}
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private Adjustment hadjustment;
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public Adjustment Hadjustment {
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get { return hadjustment; }
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set {
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if (value == hadjustment) {
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return;
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}
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hadjustment = value;
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if (hadjustment == null) {
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return;
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}
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hadjustment.ValueChanged += OnHadjustmentChanged;
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UpdateAdjustments ();
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}
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}
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private Adjustment vadjustment;
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public Adjustment Vadjustment {
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get { return vadjustment; }
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set {
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if (value == vadjustment) {
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return;
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}
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vadjustment = value;
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if (vadjustment == null) {
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return;
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}
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vadjustment.ValueChanged += OnVadjustmentChanged;
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UpdateAdjustments ();
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}
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}
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private int HadjustmentValue {
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get { return hadjustment == null ? 0 : (int)hadjustment.Value; }
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}
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private int VadjustmentValue {
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get { return vadjustment == null ? 0 : (int)vadjustment.Value; }
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}
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public Gtk.ScrollablePolicy HscrollPolicy {
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get; set;
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}
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public Gtk.ScrollablePolicy VscrollPolicy {
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get; set;
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}
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private void UpdateAdjustments ()
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{
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int layoutWidth, layoutHeight;
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Layout.GetPixelSize (out layoutWidth, out layoutHeight);
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if (hadjustment != null) {
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hadjustment.Upper = ContentArea.Width;
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hadjustment.StepIncrement = 10.0;
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if (hadjustment.Value + hadjustment.PageSize > hadjustment.Upper) {
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hadjustment.Value = hadjustment.Upper - hadjustment.PageSize;
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}
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hadjustment.Change ();
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}
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if (vadjustment != null) {
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vadjustment.Upper = ContentArea.Height;
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vadjustment.StepIncrement = layoutHeight;
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if (vadjustment.Value + vadjustment.PageSize > vadjustment.Upper) {
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vadjustment.Value = vadjustment.Upper - vadjustment.PageSize;
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}
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vadjustment.Change ();
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}
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}
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private void OnHadjustmentChanged (object o, EventArgs args)
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{
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UpdateAdjustments ();
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QueueDraw ();
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}
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private void OnVadjustmentChanged (object o, EventArgs args)
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{
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UpdateAdjustments ();
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QueueDraw ();
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}
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}
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