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![Bertrand Lorentz](/assets/img/avatar_default.png)
The main difference with the C demo is that we can't use GResource, as it's only in gio 2.32 and later, so '@import url("resource://...' won't work. Instead, we use a separate CssProvider to apply reset.css.
100 lines
2.4 KiB
C#
100 lines
2.4 KiB
C#
/* CSS Theming/CSS Basics
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*
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* Gtk themes are written using CSS. Every widget is build of multiple items
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* that you can style very similarly to a regular website.
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*
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*/
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using System;
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using System.IO;
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using System.Reflection;
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using Gtk;
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namespace GtkDemo
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{
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[Demo ("CSS Basics", "DemoCssBasics.cs", "CSS Theming")]
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public class DemoCssBasics : Window
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{
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TextBuffer buffer;
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CssProvider provider;
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CssProvider provider_reset;
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public DemoCssBasics () : base ("CSS Basics")
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{
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SetDefaultSize (600, 500);
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buffer = new TextBuffer (null);
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var warning = new TextTag ("warning");
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warning.Underline = Pango.Underline.Single;
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buffer.TagTable.Add (warning);
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var error = new TextTag ("error");
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error.Underline = Pango.Underline.Error;
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buffer.TagTable.Add (error);
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provider = new CssProvider ();
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provider_reset = new CssProvider ();
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var container = new ScrolledWindow ();
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Add (container);
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var view = new TextView (buffer);
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container.Add (view);
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buffer.Changed += OnCssTextChanged;
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using (Stream stream = Assembly.GetExecutingAssembly ().GetManifestResourceStream ("reset.css"))
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using (StreamReader reader = new StreamReader(stream))
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{
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provider_reset.LoadFromData (reader.ReadToEnd());
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}
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using (Stream stream = Assembly.GetExecutingAssembly ().GetManifestResourceStream ("css_basics.css"))
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using (StreamReader reader = new StreamReader(stream))
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{
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buffer.Text = reader.ReadToEnd();
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}
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// TODO: Connect to "parsing-error" signal in CssProvider, added in GTK+ 3.2
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ApplyCss (this, provider_reset, 800);
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ApplyCss (this, provider, UInt32.MaxValue);
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ShowAll ();
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}
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private void ApplyCss (Widget widget, CssProvider provider, uint priority)
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{
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widget.StyleContext.AddProvider (provider, priority);
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var container = widget as Container;
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if (container != null) {
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foreach (var child in container.Children) {
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ApplyCss (child, provider, priority);
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}
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}
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}
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private void OnCssTextChanged (object sender, EventArgs e)
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{
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var start = buffer.StartIter;
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var end = buffer.EndIter;
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buffer.RemoveAllTags (start, end);
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string text = buffer.Text;
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try {
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provider.LoadFromData (text);
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} catch (GLib.GException) {
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// Ignore parsing errors
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}
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StyleContext.ResetWidgets (Gdk.Screen.Default);
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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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