mirror of
https://github.com/Ryujinx/GtkSharp.git
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207 lines
6.4 KiB
C#
207 lines
6.4 KiB
C#
/* Text Widget/Hypertext
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*
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* Usually, tags modify the appearance of text in the view, e.g. making it
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* bold or colored or underlined. But tags are not restricted to appearance.
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* They can also affect the behavior of mouse and key presses, as this demo
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* shows.
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*/
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using System;
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using System.Collections.Generic;
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using Gtk;
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namespace GtkDemo
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{
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[Demo ("Hyper Text", "DemoHyperText.cs", "Text Widget")]
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public class DemoHyperText : Gtk.Window
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{
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bool hoveringOverLink = false;
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Gdk.Cursor handCursor, regularCursor;
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public DemoHyperText () : base ("HyperText")
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{
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handCursor = new Gdk.Cursor (Gdk.CursorType.Hand2);
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regularCursor = new Gdk.Cursor (Gdk.CursorType.Xterm);
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SetDefaultSize (450, 450);
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TextView view = new TextView ();
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view.WrapMode = WrapMode.Word;
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view.KeyPressEvent += new KeyPressEventHandler (KeyPress);
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view.WidgetEventAfter += new WidgetEventAfterHandler (EventAfter);
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view.MotionNotifyEvent += new MotionNotifyEventHandler (MotionNotify);
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view.VisibilityNotifyEvent += new VisibilityNotifyEventHandler (VisibilityNotify);
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ScrolledWindow sw = new ScrolledWindow ();
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sw.SetPolicy (Gtk.PolicyType.Automatic, Gtk.PolicyType.Automatic);
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Add (sw);
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sw.Add (view);
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ShowPage (view.Buffer, 1);
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ShowAll ();
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}
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IDictionary<TextTag, int> tag_pages = new Dictionary<TextTag, int> ();
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// Inserts a piece of text into the buffer, giving it the usual
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// appearance of a hyperlink in a web browser: blue and underlined.
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// Additionally, attaches some data on the tag, to make it recognizable
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// as a link.
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void InsertLink (TextBuffer buffer, ref TextIter iter, string text, int page)
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{
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TextTag tag = new TextTag (null);
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tag.Foreground = "blue";
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tag.Underline = Pango.Underline.Single;
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tag_pages [tag] = page;
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buffer.TagTable.Add (tag);
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buffer.InsertWithTags (ref iter, text, tag);
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}
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// Fills the buffer with text and interspersed links. In any real
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// hypertext app, this method would parse a file to identify the links.
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void ShowPage (TextBuffer buffer, int page)
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{
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buffer.Text = "";
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TextIter iter = buffer.StartIter;
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if (page == 1) {
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buffer.Insert (ref iter, "Some text to show that simple ");
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InsertLink (buffer, ref iter, "hypertext", 3);
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buffer.Insert (ref iter, " can easily be realized with ");
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InsertLink (buffer, ref iter, "tags", 2);
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buffer.Insert (ref iter, ".");
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} else if (page == 2) {
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buffer.Insert (ref iter,
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"A tag is an attribute that can be applied to some range of text. " +
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"For example, a tag might be called \"bold\" and make the text inside " +
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"the tag bold. However, the tag concept is more general than that; " +
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"tags don't have to affect appearance. They can instead affect the " +
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"behavior of mouse and key presses, \"lock\" a range of text so the " +
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"user can't edit it, or countless other things.\n");
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InsertLink (buffer, ref iter, "Go back", 1);
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} else if (page == 3) {
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TextTag tag = buffer.TagTable.Lookup ("bold");
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if (tag == null) {
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tag = new TextTag ("bold");
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tag.Weight = Pango.Weight.Bold;
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buffer.TagTable.Add (tag);
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}
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buffer.InsertWithTags (ref iter, "hypertext:\n", tag);
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buffer.Insert (ref iter,
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"machine-readable text that is not sequential but is organized " +
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"so that related items of information are connected.\n");
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InsertLink (buffer, ref iter, "Go back", 1);
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}
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}
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// Looks at all tags covering the position of iter in the text view,
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// and if one of them is a link, follow it by showing the page identified
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// by the data attached to it.
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void FollowIfLink (TextView view, TextIter iter)
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{
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foreach (TextTag tag in iter.Tags) {
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int page = tag_pages [tag];
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ShowPage (view.Buffer, (int)page);
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}
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}
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// Looks at all tags covering the position (x, y) in the text view,
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// and if one of them is a link, change the cursor to the "hands" cursor
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// typically used by web browsers.
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void SetCursorIfAppropriate (TextView view, int x, int y)
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{
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bool hovering = false;
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TextIter iter;
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view.GetIterAtLocation (out iter, x, y);
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foreach (TextTag tag in iter.Tags) {
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hovering = true;
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break;
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}
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if (hovering != hoveringOverLink) {
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Gdk.Window window = view.GetWindow (Gtk.TextWindowType.Text);
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hoveringOverLink = hovering;
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if (hoveringOverLink)
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window.Cursor = handCursor;
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else
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window.Cursor = regularCursor;
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}
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}
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// Links can be activated by pressing Enter.
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void KeyPress (object sender, KeyPressEventArgs args)
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{
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TextView view = sender as TextView;
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switch ((Gdk.Key) args.Event.KeyValue) {
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case Gdk.Key.Return:
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case Gdk.Key.KP_Enter:
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TextIter iter = view.Buffer.GetIterAtMark (view.Buffer.InsertMark);
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FollowIfLink (view, iter);
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break;
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default:
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break;
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}
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}
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// Links can also be activated by clicking.
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void EventAfter (object sender, WidgetEventAfterArgs args)
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{
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if (args.Event.Type != Gdk.EventType.ButtonRelease)
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return;
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Gdk.EventButton evt = (Gdk.EventButton)args.Event;
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if (evt.Button != 1)
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return;
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TextView view = sender as TextView;
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TextIter start, end, iter;
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int x, y;
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// we shouldn't follow a link if the user has selected something
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view.Buffer.GetSelectionBounds (out start, out end);
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if (start.Offset != end.Offset)
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return;
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view.WindowToBufferCoords (TextWindowType.Widget, (int) evt.X, (int) evt.Y, out x, out y);
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view.GetIterAtLocation (out iter, x, y);
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FollowIfLink (view, iter);
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}
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// Update the cursor image if the pointer moved.
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void MotionNotify (object sender, MotionNotifyEventArgs args)
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{
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TextView view = sender as TextView;
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int x, y;
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Gdk.ModifierType state;
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view.WindowToBufferCoords (TextWindowType.Widget, (int) args.Event.X, (int) args.Event.Y, out x, out y);
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SetCursorIfAppropriate (view, x, y);
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view.Window.GetPointer (out x, out y, out state);
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}
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// Also update the cursor image if the window becomes visible
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// (e.g. when a window covering it got iconified).
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void VisibilityNotify (object sender, VisibilityNotifyEventArgs a)
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{
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TextView view = sender as TextView;
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int wx, wy, bx, by;
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view.GetPointer (out wx, out wy);
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view.WindowToBufferCoords (TextWindowType.Widget, wx, wy, out bx, out by);
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SetCursorIfAppropriate (view, bx, by);
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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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}
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}
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