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GtkSharp.CellRenderer: implement https://github.com/mono/gtk-sharp/blob/master/gtk/glue/gtk/cellrenderer.c

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This commit is contained in:
lytico 2020-04-21 17:28:34 +02:00
parent 7054da77af
commit 38a43f7a7e
2 changed files with 166 additions and 4 deletions
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166
Source/Libs/GtkSharp/CellRenderer.GetSize.cs Normal file
View file

@ -0,0 +1,166 @@
using GtkSharp;
namespace Gtk
{
using System;
using System.Runtime.InteropServices;
public partial class CellRenderer
{
static GetSizeNativeDelegate GetSize_cb_delegate;
static GetSizeNativeDelegate GetSizeVMCallback {
get {
if (GetSize_cb_delegate == null)
GetSize_cb_delegate = new GetSizeNativeDelegate (GetSize_cb);
return GetSize_cb_delegate;
}
}
static void OverrideGetSize (GLib.GType gtype)
{
OverrideGetSize (gtype, GetSizeVMCallback);
}
/// <summary>
/// sets callback GetSize in GtkCellRendererClass-Struct
/// </summary>
/// <param name="gtype"></param>
/// <param name="callback"></param>
static void OverrideGetSize (GLib.GType gtype, GetSizeNativeDelegate callback)
{
unsafe {
IntPtr* raw_ptr = (IntPtr*) (((long) gtype.GetClassPtr ()) + (long) class_abi.GetFieldOffset ("get_size"));
*raw_ptr = Marshal.GetFunctionPointerForDelegate ((Delegate) callback);
}
}
// We have to implement this VM manually because x_offset, y_offset, width and height params may be NULL and therefore cannot be treated as "out int"
[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
internal delegate void GetSizeNativeDelegate (IntPtr item, IntPtr widget, IntPtr cell_area_ptr, IntPtr x_offset, IntPtr y_offset, IntPtr width, IntPtr height);
static void GetSize_cb (IntPtr item, IntPtr widget, IntPtr cell_area_ptr, IntPtr x_offset, IntPtr y_offset, IntPtr width, IntPtr height)
{
try {
CellRenderer obj = GLib.Object.GetObject (item, false) as CellRenderer;
Gtk.Widget widg = GLib.Object.GetObject (widget, false) as Gtk.Widget;
Gdk.Rectangle cell_area = Gdk.Rectangle.Zero;
if (cell_area_ptr != IntPtr.Zero)
cell_area = Gdk.Rectangle.New (cell_area_ptr);
int a, b, c, d;
obj.OnGetSize (widg, ref cell_area, out a, out b, out c, out d);
if (x_offset != IntPtr.Zero)
Marshal.WriteInt32 (x_offset, a);
if (y_offset != IntPtr.Zero)
Marshal.WriteInt32 (y_offset, b);
if (width != IntPtr.Zero)
Marshal.WriteInt32 (width, c);
if (height != IntPtr.Zero)
Marshal.WriteInt32 (height, d);
} catch (Exception e) {
GLib.ExceptionManager.RaiseUnhandledException (e, false);
}
}
[GLib.DefaultSignalHandler (Type = typeof(Gtk.CellRenderer), ConnectionMethod = nameof(OverrideGetSize))]
protected virtual void OnGetSize (Gtk.Widget widget, ref Gdk.Rectangle cell_area, out int x_offset, out int y_offset, out int width, out int height)
{
InternalOnGetSize (widget, ref cell_area, out x_offset, out y_offset, out width, out height);
}
private void InternalOnGetSize (Gtk.Widget widget, ref Gdk.Rectangle cell_area, out int x_offset, out int y_offset, out int width, out int height)
{
IntPtr native_cell_area = GLib.Marshaller.StructureToPtrAlloc (cell_area);
gtksharp_cellrenderer_base_get_size (Handle, widget?.Handle ?? IntPtr.Zero, native_cell_area, out x_offset, out y_offset, out width, out height);
cell_area = Gdk.Rectangle.New (native_cell_area);
Marshal.FreeHGlobal (native_cell_area);
}
static GetSizeNativeDelegate InternalGetSizeNativeDelegate (GLib.GType gtype)
{
GetSizeNativeDelegate unmanaged = null;
unsafe {
IntPtr* raw_ptr = (IntPtr*) (((long) gtype.GetClassPtr ()) + (long) class_abi.GetFieldOffset ("get_size"));
if (*raw_ptr == IntPtr.Zero)
return default;
unmanaged = Marshal.GetDelegateForFunctionPointer<GetSizeNativeDelegate> (*raw_ptr);
}
return unmanaged;
}
static void gtksharp_cellrenderer_base_get_size (IntPtr cell, IntPtr widget, IntPtr cell_area, out int x_offset, out int y_offset, out int width, out int height)
{
/*
const gchar *__gtype_prefix = "__gtksharp_";
#define HAS_PREFIX(a) (*((guint64 *)(a)) == *((guint64 *) __gtype_prefix))
static GObjectClass *
get_threshold_class (GObject *obj)
{
GType gtype = G_TYPE_FROM_INSTANCE (obj);
while (HAS_PREFIX (g_type_name (gtype)))
gtype = g_type_parent (gtype);
GObjectClass *klass = g_type_class_peek (gtype);
if (klass == NULL) klass = g_type_class_ref (gtype);
return klass;
}
void gtksharp_cellrenderer_base_get_size (GtkCellRenderer *cell, GtkWidget *widget, GdkRectangle *cell_area, gint *x_offset, gint *y_offset, gint *width, gint *height)
{
GtkCellRendererClass *klass = (GtkCellRendererClass *) get_threshold_class (G_OBJECT (cell));
if (klass->get_size)
(* klass->get_size) (cell, widget, cell_area, x_offset, y_offset, width, height);
}
*/
x_offset = 0;
y_offset = 0;
width = 0;
height = 0;
if (cell == IntPtr.Zero) {
return;
}
var obj = TryGetObject (cell);
var parent = obj.NativeType;
while ((parent = parent.GetBaseType ()) != GLib.GType.None) {
if (parent.ToString ().StartsWith ("__gtksharp_")) {
continue;
}
var GetSize = InternalGetSizeNativeDelegate (parent);
if (GetSize != default) {
var a = Marshal.AllocHGlobal (sizeof(int));
var b = Marshal.AllocHGlobal (sizeof(int));
var c = Marshal.AllocHGlobal (sizeof(int));
var d = Marshal.AllocHGlobal (sizeof(int));
try {
GetSize (cell, widget, cell_area, a, b, c, d);
if (a != IntPtr.Zero)
Marshal.WriteInt32 (a, x_offset);
if (b != IntPtr.Zero)
Marshal.WriteInt32 (b, y_offset);
if (c != IntPtr.Zero)
Marshal.WriteInt32 (c, width);
if (d != IntPtr.Zero)
Marshal.WriteInt32 (d, height);
} finally {
Marshal.FreeHGlobal (a);
Marshal.FreeHGlobal (b);
Marshal.FreeHGlobal (c);
Marshal.FreeHGlobal (d);
}
}
}
return;
}
}
}

4
Source/Libs/GtkSharp/CellRenderer.cs
View file

@ -48,10 +48,6 @@ namespace Gtk {
gtk_cell_renderer_render2 (Handle, context == null ? IntPtr.Zero : context.Handle, widget == null ? IntPtr.Zero : widget.Handle, ref background_area, ref cell_area, ref expose_area, (int) flags);
}
// We have to implement this VM manually because x_offset, y_offset, width and height params may be NULL and therefore cannot be treated as "out int"
// TODO: Implement "nullable" attribute for value type parameters in GAPI
[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
delegate void OnGetSizeDelegate (IntPtr item, IntPtr widget, IntPtr cell_area_ptr, IntPtr x_offset, IntPtr y_offset, IntPtr width, IntPtr height);
}
}