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//
// CustomCellRenderer.cs
//
// Author:
// Lluis Sanchez <lluis@xamarin.com>
//
// Copyright (c) 2013 Xamarin Inc.
//
// 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 Xwt.CairoBackend;
using Xwt.Backends;
using Xwt.GtkBackend;
namespace Xwt.GtkBackend
{
class CustomCellRenderer: CellViewBackend, ICanvasCellViewBackend
{
Rectangle cellArea;
Rectangle backgroundArea;
bool isSelected;
bool hasFocus;
bool isPrelit;
TreeIter lastIter;
bool shown;
public override void Initialize (ICellViewFrontend cellView, ICellRendererTarget rendererTarget, object target)
{
base.Initialize (cellView, rendererTarget, target);
CellRenderer = new CanvasRenderer {
Parent = this,
CellView = (ICanvasCellViewFrontend) cellView
};
}
internal void StartDrawing (Rectangle ba, Rectangle ca, Gtk.CellRendererState flags)
{
this.cellArea = ca;
this.backgroundArea = ba;
isSelected = (flags & CellRendererState.Selected) != 0;
hasFocus = (flags & CellRendererState.Focused) != 0;
isPrelit = (flags & CellRendererState.Prelit) != 0;
// Gtk will rerender the cell on every status change, hence we can expect the values
// set here to be valid until the geometry or any other status of the cell and tree changes.
// Setting shown=true ensures that those values are always reused instead if queried
// from the parent tree after the cell has been rendered.
shown = true;
}
protected override void OnLoadData ()
{
if (!CurrentIter.Equals (lastIter)) {
// if the current iter has changed all cached values from the last draw are invalid
shown = false;
lastIter = CurrentIter;
}
base.OnLoadData ();
}
internal void EndDrawing ()
{
}
public override Rectangle CellBounds {
get {
if (shown)
return cellArea;
return base.CellBounds;
}
}
public override Rectangle BackgroundBounds {
get {
if (shown)
return backgroundArea;
return base.BackgroundBounds;
}
}
public override bool Selected {
get {
if (shown)
return isSelected;
return base.Selected;
}
}
public override bool HasFocus {
get {
if (shown)
return hasFocus;
return base.HasFocus;
}
}
public bool IsHighlighted {
get {
if (shown)
return isPrelit;
return false;
}
}
}
class CanvasRenderer: GtkCellRendererCustom
{
public ICanvasCellViewFrontend CellView;
public CustomCellRenderer Parent;
protected override void OnRender (Cairo.Context cr, Gtk.Widget widget, Gdk.Rectangle background_area, Gdk.Rectangle cell_area, CellRendererState flags)
{
int wx, wy, dx = 0, dy = 0;
var tree = widget as Gtk.TreeView;
// Tree coordinates must be converted to widget coordinates,
// otherwise custom cell bounds will have an offset to the parent widget
if (tree != null) {
tree.ConvertBinWindowToWidgetCoords (cell_area.X, cell_area.Y, out wx, out wy);
dx = wx - cell_area.X;
dy = wy - cell_area.Y;
cell_area.X += dx;
background_area.X += dx;
cell_area.Y += dy;
background_area.Y += dy;
}
Parent.StartDrawing (new Rectangle (background_area.X, background_area.Y, background_area.Width, background_area.Height), new Rectangle (cell_area.X, cell_area.Y, cell_area.Width, cell_area.Height), flags);
CellView.ApplicationContext.InvokeUserCode (delegate {
CairoContextBackend ctx = new CairoContextBackend (Util.GetScaleFactor (widget));
ctx.Context = cr;
ctx.Context.Translate(-dx, -dy);
using (ctx) {
CellView.Draw (ctx, new Rectangle (cell_area.X, cell_area.Y, cell_area.Width, cell_area.Height));
}
});
Parent.EndDrawing ();
}
protected override void OnGetSize (Gtk.Widget widget, ref Gdk.Rectangle cell_area, out int x_offset, out int y_offset, out int width, out int height)
{
Size size = new Size ();
var widthConstraint = cell_area.Width > 0 ? SizeConstraint.WithSize(cell_area.Width) : SizeConstraint.Unconstrained;
CellView.ApplicationContext.InvokeUserCode (delegate {
size = CellView.GetRequiredSize (widthConstraint);
});
width = (int) size.Width;
height = (int) size.Height;
x_offset = y_offset = 0;
}
}
}
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