//顺序改变
private void Bitmaps_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
//Undo：撤销
//当在界面上拖动ListView改变顺序时，会因为List.Move方法而触发CollectionChanged集合改变事件
//可以根据集合改变事件new一个撤销类，再把上次的图层的顺序打进去。
//问题在于，无论List.Add还是List.Move都会触发集合改变事件，
//于是记录List.Count存储到App.Model.LayersCount 里
//当新的List.Count和旧的记录数App.Model.LayersCount相等时，就知道这次的集合改变事件是List.Move触发的，打入撤销类
//如果不是就知道这是List,Add或List.Remove或别的什么方法触发的集合改变事件，就不撤销
if (undo != null)
{
if (undo.Layers != null)
{
if (App.Model.LayersCount == App.Model.Layers.Count)
{
if (App.Model.isCanUndo == true)
{
App.Model.Undos.Add(undo);//打入旧的撤销类
//更新撤销类
undo = new Undo();
undo.CollectionInstantiation(App.Model.Index, App.Model.Layers);
}
}
}
}
App.Model.isReRender = true; //重新渲染
App.Model.Refresh++; //画布刷新
}
//Merge Visual：合并可见
private void LayerMergeVisualButton_Click(object sender, RoutedEventArgs e)
{
App.Model.isCanUndo = false;//关闭撤销
//更新撤销类
Undo undo = new Undo();
undo.CollectionInstantiation(App.Model.Index, App.Model.Layers);
App.UndoAdd(undo);
//新建渲染目标=>层
CanvasRenderTarget crt = new CanvasRenderTarget(App.Model.VirtualControl, App.Model.Width, App.Model.Height);
using (CanvasDrawingSession ds = crt.CreateDrawingSession())
{
ds.Clear(Colors.Transparent);
ICanvasImage ci = App.Model.NullRenderTarget;
for (int i = App.Model.Layers.Count - 1; i >= 0; i--) //自下而上渲染
{
ci = App.Render(App.Model.Layers[i], ci); //渲染
}
ds.DrawImage(ci);
}
//删掉所有可视图层
for (int i = App.Model.Layers.Count - 1; i >= 0; i--)//自下而上
{
Layer L = App.Model.Layers[i];
if (L.Visual == true)
{
App.Model.Layers.Remove(L);
}
}
//插入与索引
Layer l = new Layer {
Name = App.resourceLoader.GetString("/Layer/NameMerge_"), Visual = true, Opacity = 100, CanvasRenderTarget = crt,
};
if (App.Model.isLowView)
{
l.LowView();
}
else
{
l.SquareView();
}
l.SetWriteableBitmap(App.Model.VirtualControl);//刷新缩略图
App.Model.Layers.Insert(0, l);
App.Model.Index = 0;
App.Model.isCanUndo = true; //打开撤销
App.Model.LayersCount = App.Model.Layers.Count; //Undo：撤销
Jugde(); //判断
}
private void Undo()
{
if (App.Model.UndoIndex + 1 == App.Model.Undos.Count)//如果是第一次撤销
{
//根据最后的一个撤销的类型，保留当前的状态为新的撤销类
Undo undo = new Undo();
switch (App.Model.Undos.Last().undeoType)
{
case UndeoType.Targe:
undo.TargeInstantiation(App.Model.Index, App.Model.CurrentRenderTarget);
break;
case UndeoType.Mask:
undo.MaskInstantiation(App.Model.MaskRenderTarget, App.Model.MaskAnimatedTarget);
break;
case UndeoType.Index:
undo.IndexInstantiation(App.Model.Index);
break;
case UndeoType.Collection:
undo.CollectionInstantiation(App.Model.Index, App.Model.Layers);
break;
//case UndeoTyte.LayerAdd :break;
//case UndeoTyte.LayerRemove :break;
case UndeoType.Visual:
undo.VisualInstantiation(App.Model.Index, App.Model.Layers[App.Model.Index].Visual);
break;
case UndeoType.Opacity:
undo.OpacityInstantiation(App.Model.Index, App.Model.Layers[App.Model.Index].Opacity);
break;
case UndeoType.Blend:
undo.BlendInstantiation(App.Model.Index, App.Model.Layers[App.Model.Index].BlendIndex);
break;
case UndeoType.Tool:
undo.ToolInstantiation(App.Model.Tool);
break;
default: break;
}
App.Model.Undos.Add(undo);
}
if (App.Model.Undos.Count > 2 && App.Model.UndoIndex >= 0)
{
App.Model.Undos[App.Model.UndoIndex].Perform(); //后退
App.Model.UndoIndex--; //撤销索引后退一步
App.Model.isRedo = true; //重做可用
}
else
{
App.Model.isUndo = false; //撤销不可用
}
}
public LayerControl()
{
this.InitializeComponent();
this.DataContext = App.Model;
App.Model.Layers.CollectionChanged += Bitmaps_CollectionChanged; //挂集合变化事件
ListView.ItemsSource = App.Model.Layers; //绑定集合
//Undo：撤销
undo = new Undo();
undo.CollectionInstantiation(App.Model.Index, App.Model.Layers);
}
//Merge All：全部合并
private void LayerMergeAllButton_Click(object sender, RoutedEventArgs e)
{
App.Model.isCanUndo = false;//关闭撤销
//更新撤销类
Undo undo = new Undo();
undo.CollectionInstantiation(App.Model.Index, App.Model.Layers);
App.UndoAdd(undo);
//新建渲染目标层
CanvasRenderTarget crt = new CanvasRenderTarget(App.Model.VirtualControl, App.Model.Width, App.Model.Height);
using (CanvasDrawingSession ds = crt.CreateDrawingSession())
{
ds.Clear(Colors.Transparent);
//全部合并
ICanvasImage ci = App.Model.NullRenderTarget;
for (int i = App.Model.Layers.Count - 1; i >= 0; i--) //自下而上渲染
{
ci = App.Render(App.Model.Layers[i], ci); //渲染
}
ds.DrawImage(ci);
}
//删掉所有图层
App.Model.Layers.Clear();
//插入层
Layer l = new Layer {
Name = App.resourceLoader.GetString("/Layer/NameMerge_"), CanvasRenderTarget = crt,
};
if (App.Model.isLowView)
{
l.LowView();
}
else
{
l.SquareView();
}
l.SetWriteableBitmap(App.Model.VirtualControl);
App.Model.Layers.Add(l);
App.Model.Index = 0; //不产生撤销类的改变索引的方法，适用于撤销的操作
App.Model.isCanUndo = true; //开启撤销
App.Model.LayersCount = App.Model.Layers.Count; //Undo：撤销
Jugde(); //判断
}
