如何对 ColumnDefinition 的 Width 或 RowDefinition 的 Height 进行数据绑定? [英] How do I databind a ColumnDefinition's Width or RowDefinition's Height?
本文介绍了如何对 ColumnDefinition 的 Width 或 RowDefinition 的 Height 进行数据绑定?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
Under the View-Model-ViewModel pattern for WPF, I am trying to databind the Heights and Widths of various definitions for grid controls, so I can store the values the user sets them to after using a GridSplitter. However, the normal pattern doesn't seem to work for these particular properties.
Note: I'm posting this as a reference question that I'm posting as Google failed me and I had to work this out myself. My own answer to follow.
解决方案
There were a number of gotchas I discovered:
- Although it may appear like a double in XAML, the actual value for a *Definition's Height or Width is a 'GridLength' struct.
- All the properties of GridLength are readonly, you have to create a new one each time you change it.
- Unlike every other property in WPF, Width and Height don't default their databinding mode to 'TwoWay', you have to manually set this.
Thusly, I used the following code:
private GridLength myHorizontalInputRegionSize = new GridLength(0, GridUnitType.Auto)
public GridLength HorizontalInputRegionSize
{
get
{
// If not yet set, get the starting value from the DataModel
if (myHorizontalInputRegionSize.IsAuto)
myHorizontalInputRegionSize = new GridLength(ConnectionTabDefaultUIOptions.HorizontalInputRegionSize, GridUnitType.Pixel);
return myHorizontalInputRegionSize;
}
set
{
myHorizontalInputRegionSize = value;
if (ConnectionTabDefaultUIOptions.HorizontalInputRegionSize != myHorizontalInputRegionSize.Value)
{
// Set the value in the DataModel
ConnectionTabDefaultUIOptions.HorizontalInputRegionSize = value.Value;
}
OnPropertyChanged("HorizontalInputRegionSize");
}
}
And the XAML:
<Grid.RowDefinitions>
<RowDefinition Height="*" MinHeight="100" />
<RowDefinition Height="Auto" />
<RowDefinition Height="{Binding Path=HorizontalInputRegionSize,Mode=TwoWay}" MinHeight="50" />
</Grid.RowDefinitions>
这篇关于如何对 ColumnDefinition 的 Width 或 RowDefinition 的 Height 进行数据绑定?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文