单击、拖动和滚动画布视图
我有一个带有 Canvas ItemsPanelTemplate 的列表框。我知道 ScrollViewer 不能与 Canvas 一起使用,除非给定高度和宽度。我不想给画布指定高度和宽度,因为它并不总是恒定的。是否还有任何其他解决方法或技巧可以解决这种情况。我知道我不是唯一一个遇到这个问题的人。预先感谢这是我到目前为止的代码。
另一个问题是我无法将 ScrollViewer 放置在 ItemsPanelTemplate 中,因为它只能嵌套一个元素。
这也限制了我将画布放置在网格内以获得定位。
XAML:
<!--Core Viewer-->
<ScrollViewer x:Name="scrollViewer"
VerticalScrollBarVisibility="Hidden"
HorizontalScrollBarVisibility="Hidden">
<ListBox x:Name="objCoreViewer"
ItemsSource="{Binding ItemsSource}"
Background="LightGray"
SelectionChanged="objCoreViewer_SelectionChanged"
ItemTemplateSelector="{DynamicResource CoreViewerDataTemplateSelector}"
ItemContainerStyleSelector="{DynamicResource ItemContainerStyleSelector}"
PreviewMouseWheel="objCoreViewer_PreviewMouseWheel">
<!-- Core Map Canvas -->
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<Canvas x:Name="objCoreViewerCanvas"
Background="Transparent">
<Canvas.LayoutTransform>
<ScaleTransform ScaleX="{Binding Path=Value, ElementName=ZoomSlider}"
ScaleY="{Binding Path=Value, ElementName=ZoomSlider}" />
</Canvas.LayoutTransform>
</Canvas>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</ScrollViewer>
I have a ListBox with a ItemsPanelTemplate of Canvas. I know the ScrollViewer will not work with the Canvas unless its given a height and width. I DO NOT want to give the canvas a height and width because it will not always be constant. Is there any other work around or tricks anyone has gotten to work for this situation. I know I can't be the only one with this problem. Thanks in advance here is my code so far.
Another problem is I am unable to place the ScrollViewer inside the ItemsPanelTemplate because it can only have one element nested inside.
This also restricts me from placing the canvas inside a grid to get positioning.
XAML:
<!--Core Viewer-->
<ScrollViewer x:Name="scrollViewer"
VerticalScrollBarVisibility="Hidden"
HorizontalScrollBarVisibility="Hidden">
<ListBox x:Name="objCoreViewer"
ItemsSource="{Binding ItemsSource}"
Background="LightGray"
SelectionChanged="objCoreViewer_SelectionChanged"
ItemTemplateSelector="{DynamicResource CoreViewerDataTemplateSelector}"
ItemContainerStyleSelector="{DynamicResource ItemContainerStyleSelector}"
PreviewMouseWheel="objCoreViewer_PreviewMouseWheel">
<!-- Core Map Canvas -->
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<Canvas x:Name="objCoreViewerCanvas"
Background="Transparent">
<Canvas.LayoutTransform>
<ScaleTransform ScaleX="{Binding Path=Value, ElementName=ZoomSlider}"
ScaleY="{Binding Path=Value, ElementName=ZoomSlider}" />
</Canvas.LayoutTransform>
</Canvas>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</ScrollViewer>
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要使画布根据其内部的子元素增长,您需要在继承自 Canavas 的自定义类中重写 Canvas 的 MeasureOverride 事件。这段代码对我来说非常有用:
To get the canvas to grow based on the the child elements inside of it you will need to override the Canvas's MeasureOverride event in a custom class that inherits from Canavas. This code works great for me: