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Diffstat (limited to 'main/src/core/MonoDevelop.Ide/MonoDevelop.Components/PangoUtil.cs')
| -rw-r--r-- | main/src/core/MonoDevelop.Ide/MonoDevelop.Components/PangoUtil.cs | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/main/src/core/MonoDevelop.Ide/MonoDevelop.Components/PangoUtil.cs b/main/src/core/MonoDevelop.Ide/MonoDevelop.Components/PangoUtil.cs new file mode 100644 index 0000000000..86de702f7f --- /dev/null +++ b/main/src/core/MonoDevelop.Ide/MonoDevelop.Components/PangoUtil.cs @@ -0,0 +1,260 @@ +// +// PangoUtils.cs +// +// Author: +// Michael Hutchinson <mhutchinson@novell.com> +// +// Copyright (c) 2010 Novell, Inc. (http://www.novell.com) +// +// 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 System; +using Gtk; +using System.Runtime.InteropServices; + +namespace MonoDevelop.Components +{ + public static class PangoUtil + { + internal const string LIBGTK = "libgtk-win32-2.0-0.dll"; + internal const string LIBATK = "libatk-1.0-0.dll"; + internal const string LIBGLIB = "libglib-2.0-0.dll"; + internal const string LIBGDK = "libgdk-win32-2.0-0.dll"; + internal const string LIBGOBJECT = "libgobject-2.0-0.dll"; + internal const string LIBPANGO = "libpango-1.0-0.dll"; + internal const string LIBPANGOCAIRO = "libpangocairo-1.0-0.dll"; + internal const string LIBQUARTZ = "libgtk-quartz-2.0.dylib"; + internal const string LIBGTKGLUE = "gtksharpglue-2"; + + /// <summary> + /// This doesn't leak Pango layouts, unlike some other ways to create them in GTK# <= 2.12.11 + /// </summary> + public static Pango.Layout CreateLayout (Widget widget) + { + var ptr = gtk_widget_create_pango_layout (widget.Handle, IntPtr.Zero); + return ptr == IntPtr.Zero? null : new Pango.Layout (ptr); + } + + public static Pango.Layout CreateLayout (Widget widget, string text) + { + IntPtr textPtr = text == null? IntPtr.Zero : GLib.Marshaller.StringToPtrGStrdup (text); + + var ptr = gtk_widget_create_pango_layout (widget.Handle, textPtr); + + if (textPtr != IntPtr.Zero) + GLib.Marshaller.Free (textPtr); + + return ptr == IntPtr.Zero? null : new Pango.Layout (ptr); + } + + public static Pango.Layout CreateLayout (PrintContext context) + { + var ptr = gtk_print_context_create_pango_layout (context.Handle); + return ptr == IntPtr.Zero? null : new Pango.Layout (ptr); + } + + [DllImport (LIBGTK, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr gtk_widget_create_pango_layout (IntPtr widget, IntPtr text); + + [DllImport (LIBGTK, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr gtk_print_context_create_pango_layout (IntPtr context); + } + + /// <summary> + /// This creates a Pango list and applies attributes to it with *much* less overhead than the GTK# version. + /// </summary> + class FastPangoAttrList : IDisposable + { + IntPtr list; + + public FastPangoAttrList () + { + list = pango_attr_list_new (); + } + + public void AddStyleAttribute (Pango.Style style, uint start, uint end) + { + Add (pango_attr_style_new (style), start, end); + } + + public void AddWeightAttribute (Pango.Weight weight, uint start, uint end) + { + Add (pango_attr_weight_new (weight), start, end); + } + + public void AddForegroundAttribute (Gdk.Color color, uint start, uint end) + { + Add (pango_attr_foreground_new (color.Red, color.Green, color.Blue), start, end); + } + + public void AddBackgroundAttribute (Gdk.Color color, uint start, uint end) + { + Add (pango_attr_background_new (color.Red, color.Green, color.Blue), start, end); + } + + public void AddUnderlineAttribute (Pango.Underline underline, uint start, uint end) + { + Add (pango_attr_underline_new (underline), start, end); + } + + void Add (IntPtr attribute, uint start, uint end) + { + unsafe { + PangoAttribute *attPtr = (PangoAttribute *) attribute; + attPtr->start_index = start; + attPtr->end_index = end; + } + pango_attr_list_insert (list, attribute); + } + + /// <summary> + /// Like Splice, except it only offsets/clamps the inserted items, doesn't affect items already in the list. + /// </summary> + public void InsertOffsetList (Pango.AttrList atts, uint startOffset, uint endOffset) + { + //HACK: atts.Iterator.Attrs broken (throws NRE), so manually P/Invoke + var iter = pango_attr_list_get_iterator (atts.Handle); + try { + do { + IntPtr list = pango_attr_iterator_get_attrs (iter); + try { + int len = g_slist_length (list); + for (uint i = 0; i < len; i++) { + IntPtr val = g_slist_nth_data (list, i); + AddOffsetCopy (val, startOffset, endOffset); + } + } finally { + g_slist_free (list); + } + } while (pango_attr_iterator_next (iter)); + } finally { + pango_attr_iterator_destroy (iter); + } + } + + void AddOffsetCopy (IntPtr attr, uint startOffset, uint endOffset) + { + var copy = pango_attribute_copy (attr); + unsafe { + PangoAttribute *attPtr = (PangoAttribute *) copy; + attPtr->start_index = startOffset + attPtr->start_index; + attPtr->end_index = System.Math.Min (endOffset, startOffset + attPtr->end_index); + } + pango_attr_list_insert (list, copy); + } + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attr_style_new (Pango.Style style); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attr_stretch_new (Pango.Stretch stretch); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attr_weight_new (Pango.Weight weight); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attr_foreground_new (ushort red, ushort green, ushort blue); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attr_background_new (ushort red, ushort green, ushort blue); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attr_underline_new (Pango.Underline underline); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attr_list_new (); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern void pango_attr_list_unref (IntPtr list); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern void pango_attr_list_insert (IntPtr list, IntPtr attr); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern void pango_layout_set_attributes (IntPtr layout, IntPtr attrList); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern void pango_attr_list_splice (IntPtr attr_list, IntPtr other, Int32 pos, Int32 len); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attribute_copy (IntPtr attr); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attr_list_get_iterator (IntPtr list); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern bool pango_attr_iterator_next (IntPtr iterator); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern void pango_attr_iterator_destroy (IntPtr iterator); + + [DllImport (PangoUtil.LIBPANGO, CallingConvention=CallingConvention.Cdecl)] + static extern IntPtr pango_attr_iterator_get_attrs (IntPtr iterator); + + [DllImport (PangoUtil.LIBGLIB, CallingConvention = CallingConvention.Cdecl)] + private static extern int g_slist_length (IntPtr l); + + [DllImport (PangoUtil.LIBGLIB, CallingConvention = CallingConvention.Cdecl)] + private static extern IntPtr g_slist_nth_data (IntPtr l, uint n); + + [DllImport (PangoUtil.LIBGLIB, CallingConvention = CallingConvention.Cdecl)] + private static extern void g_slist_free (IntPtr l); + + public void Splice (Pango.AttrList attrs, int pos, int len) + { + pango_attr_list_splice (list, attrs.Handle, pos, len); + } + + public void AssignTo (Pango.Layout layout) + { + pango_layout_set_attributes (layout.Handle, list); + } + + [StructLayout (LayoutKind.Sequential)] + struct PangoAttribute + { + public IntPtr klass; + public uint start_index; + public uint end_index; + } + + public void Dispose () + { + if (list != IntPtr.Zero) { + GC.SuppressFinalize (this); + Destroy (); + } + } + + //NOTE: the list destroys all its attributes when the ref count reaches zero + void Destroy () + { + pango_attr_list_unref (list); + list = IntPtr.Zero; + } + + ~FastPangoAttrList () + { + GLib.Idle.Add (delegate { + Destroy (); + return false; + }); + } + } +}
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