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我試圖寫我自己的自定義畫布,並想繪製一個由小矩形組成的迷宮。我的問題是,我只在屏幕上得到4個小點,而不是4個矩形(當用2×2場進行嘗試時)。 下面是一些代碼:自定義畫布的問題
public class LabyrinthCanvas : System.Windows.Controls.Canvas
{
public static readonly int RectRadius = 60;
public ObservableCollection<ObservableCollection<Rect>> Rectangles;
public LabyrinthCanvas()
{
Rectangles = new ObservableCollection<ObservableCollection<Rect>>();
}
public void AddRectangles(int Height, int Width)
{
for (int iHeight = 0; iHeight < Height; iHeight++)
{
ObservableCollection<Rect> newRects = new ObservableCollection<Rect>();
newRects.CollectionChanged += RectanglesChanged;
Rectangles.Add(newRects);
for (int iWidth = 0; iWidth < Width; iWidth++)
{
Rect rect = new Rect(iHeight * RectRadius, iWidth * RectRadius);
Rectangles[iHeight].Add(rect);
}
}
}
public void RectanglesChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
{
foreach (object rect in e.NewItems)
{
if (rect is Rect)
{
this.Children.Add(((Rect)rect).innerRectangle);
System.Windows.Controls.Canvas.SetTop(((Rect)rect).innerRectangle, ((Rect)rect).YPos);
System.Windows.Controls.Canvas.SetLeft(((Rect)rect).innerRectangle, ((Rect)rect).XPos);
}
}
}
else if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Remove)
{
foreach (Rect rect in e.OldItems)
{
this.Children.Remove(rect.innerRectangle);
}
}
}
}
public class Rect : INotifyPropertyChanged
{
public Rect(int YPos, int XPos)
{
innerRectangle.Stroke = System.Windows.Media.Brushes.Black;
innerRectangle.Fill = System.Windows.Media.Brushes.Blue;
this.YPos = YPos;
this.XPos = XPos;
}
public System.Windows.Shapes.Rectangle innerRectangle = new System.Windows.Shapes.Rectangle();
public int YPos;
public int XPos;
}
我認爲重要的是:
this.Children.Add(((Rect)rect).innerRectangle);
System.Windows.Controls.Canvas.SetTop(((Rect)rect).innerRectangle, ((Rect)rect).YPos);
System.Windows.Controls.Canvas.SetLeft(((Rect)rect).innerRectangle, ((Rect)rect).XPos);
林用自己的類「矩形」,因爲我需要這是我從所示的代碼去掉了一些額外的屬性和我不能從Rectangle繼承。