在画布上控制更改大小wpf
我卡住了，并且不确定为什么当用户拖动尺寸抓手，调整画布上的控件大小时，似乎没有任何变化。但它会触发并打印到控制台。我在这里错过了什么导致它不能在wpf中调整项目的大小。我也没做任何非常复杂的事情。它很直接。我假设问题出在ResizeGizmo.cs中的某个地方。我猜是因为某些原因不允许我设定其定位的商品内容的大小。
代码
GraphNodeViewModel.cs
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace WpfApplication1
{
public class NodeViewModel : NotifyBase
{
// position coordinates
private double x = 0;
public double X
{
get { return x; }
set { Set(ref x, value); }
}
private double y = 0;
public double Y
{
get { return y; }
set { Set(ref y, value); }
}
public double Z { get; set; }
private bool isSelected = false;
public bool IsSelected
{
get { return isSelected; }
set { Set(ref isSelected, value); }
}
private string virtualName = "New Node";
public string VirtualName
{
get { return virtualName; }
set { Set(ref virtualName, value); }
}
public NodeViewModel(string virtualName, double x, double y)
{
this.virtualName = virtualName;
this.X = x;
this.Y = y;
this.Z = 100; // place top most in z space
}
}
public abstract class NotifyBase : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected void RaisePropertyChanged([CallerMemberName] string propertyName = null)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
protected bool Set<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
{
if (EqualityComparer<T>.Default.Equals(field, value)) return false;
field = value;
RaisePropertyChanged(propertyName);
return true;
}
}
}
ResizeGizmo.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
namespace WpfApplication1
{
public class ResizeGizmo : Thumb
{
public ResizeGizmo()
{
DragDelta += new DragDeltaEventHandler(this.ResizeGizmo_DragDelta);
}
private void ResizeGizmo_DragDelta(object sender, DragDeltaEventArgs e)
{
Console.WriteLine("Resizing");
Control item = this.DataContext as Control;
if (item != null)
{
double deltaVertical, deltaHorizontal;
switch (VerticalAlignment)
{
case VerticalAlignment.Bottom:
deltaVertical = Math.Min(-e.VerticalChange,
item.ActualHeight - item.MinHeight);
item.Height -= deltaVertical;
break;
case VerticalAlignment.Top:
deltaVertical = Math.Min(e.VerticalChange,
item.ActualHeight - item.MinHeight);
Canvas.SetTop(item, Canvas.GetTop(item) + deltaVertical);
item.Height -= deltaVertical;
break;
default:
break;
}
switch (HorizontalAlignment)
{
case HorizontalAlignment.Left:
deltaHorizontal = Math.Min(e.HorizontalChange,
item.ActualWidth - item.MinWidth);
Canvas.SetLeft(item, Canvas.GetLeft(item) + deltaHorizontal);
item.Width -= deltaHorizontal;
break;
case HorizontalAlignment.Right:
deltaHorizontal = Math.Min(-e.HorizontalChange,
item.ActualWidth - item.MinWidth);
item.Width -= deltaHorizontal;
break;
default:
break;
}
}
e.Handled = true;
}
}
}
MainWindow.xaml
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApplication1"
mc:Ignorable="d"
Title="MainWindow" Height="600" Width="700"
Background="sc#1,.01,.01,.01"
WindowStartupLocation="CenterScreen"
>
<Window.DataContext>
<local:MainWindowViewModel />
</Window.DataContext>
<Window.Resources>
<Style x:Key="SizeGripStyle" TargetType="{x:Type Thumb}">
<Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"/>
<Setter Property="Background" Value="#3FFFFFFF"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="BorderBrush" Value="White"/>
<Setter Property="Foreground" Value="White"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Thumb}">
<Border BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="1" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- Resize Template -->
<ControlTemplate x:Key="ResizeGizmoTemplate" TargetType="Control">
<Grid>
<local:ResizeGizmo Height="1" Cursor="SizeNS" Margin="0 -4 0 0" VerticalAlignment="Top" HorizontalAlignment="Stretch" Style="{StaticResource SizeGripStyle}"/>
<local:ResizeGizmo Width="1" Cursor="SizeWE" Margin="-4 0 0 0" VerticalAlignment="Stretch" HorizontalAlignment="Left" Style="{StaticResource SizeGripStyle}"/>
<local:ResizeGizmo Width="1" Cursor="SizeWE" Margin="0 0 -4 0" VerticalAlignment="Stretch" HorizontalAlignment="Right" Style="{StaticResource SizeGripStyle}"/>
<local:ResizeGizmo Height="1" Cursor="SizeNS" Margin="0 0 0 -4" VerticalAlignment="Bottom" HorizontalAlignment="Stretch" Style="{StaticResource SizeGripStyle}"/>
<local:ResizeGizmo Width="6" Height="6" Cursor="SizeNWSE" Margin="-6 -6 0 0" VerticalAlignment="Top" HorizontalAlignment="Left" Style="{StaticResource SizeGripStyle}"/>
<local:ResizeGizmo Width="6" Height="6" Cursor="SizeNESW" Margin="0 -6 -6 0" VerticalAlignment="Top" HorizontalAlignment="Right" Style="{StaticResource SizeGripStyle}"/>
<local:ResizeGizmo Width="6" Height="6" Cursor="SizeNESW" Margin="-6 0 0 -6" VerticalAlignment="Bottom" HorizontalAlignment="Left" Style="{StaticResource SizeGripStyle}"/>
<local:ResizeGizmo Width="6" Height="6" Cursor="SizeNWSE" Margin="0 0 -6 -6" VerticalAlignment="Bottom" HorizontalAlignment="Right" Style="{StaticResource SizeGripStyle}"/>
</Grid>
</ControlTemplate>
<DataTemplate DataType="{x:Type local:NodeViewModel}">
<!--Outside border is used to visualize selection-->
<Border CornerRadius="4"
Padding="20"
BorderThickness="1"
BorderBrush="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}, Path=BorderBrush}"
Background="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}, Path=Background}">
<Grid>
<Border>
<Grid>
<Control Template="{StaticResource ResizeGizmoTemplate}"/>
<Border Background="LightBlue" CornerRadius="4" Padding="10">
<TextBox Text="This is cool"/>
</Border>
</Grid>
</Border>
</Grid>
</Border>
</DataTemplate>
</Window.Resources>
<Grid>
<!-- visual Nodes and Connections -->
<ListBox x:Name="listBox" ItemsSource="{Binding GraphNodes}"
SelectionMode="Extended"
Background="Transparent">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<Canvas />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem" >
<Setter Property="Canvas.Left" Value="{Binding X}" />
<Setter Property="Canvas.Top" Value="{Binding Y}" />
<Setter Property="Panel.ZIndex" Value="{Binding Z}" />
<Setter Property="IsSelected" Value="{Binding IsSelected}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<ContentPresenter/>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="True" >
<Setter Property="Background" Value="sc#0.3,1,1,1"/>
<Setter Property="BorderBrush" Value="White"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.Resources>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
</ListBox.Resources>
</ListBox>
<!-- This Canvas is used to render a drag selection rectangle -->
<Canvas x:Name="dragSelectionCanvas" Visibility="Collapsed" >
<Border
x:Name="dragSelectionBorder"
BorderBrush="White"
BorderThickness="1"
Background="sc#0.1,1,1,1"
CornerRadius="2"
Opacity=".5"
IsHitTestVisible="False"
/>
</Canvas>
</Grid>
</Window>
MainWindowViewModel.cs
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
namespace WpfApplication1
{
public class MainWindowViewModel : NotifyBase
{
private ObservableCollection<NodeViewModel> graphNodes = new ObservableCollection<NodeViewModel>();
public ObservableCollection<NodeViewModel> GraphNodes { get { return graphNodes; } }
public MainWindowViewModel()
{
// Populate the view model with some example data.
graphNodes.Add(new NodeViewModel("Type here", 50, 50));
graphNodes.Add(new NodeViewModel("Type in another box here", 180, 150));
graphNodes.Add(new NodeViewModel("This is fun", 160, 70));
graphNodes.Add(new NodeViewModel("Why is this working", 320, 230));
graphNodes.Add(new NodeViewModel("ABC", 20, 170));
}
}
}
1 个答案:
答案 0 :(得分：0)
创建了一个可行的解决方案！
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Media;
namespace WpfApplication1
{
public class ResizeGizmo : Thumb
{
public ResizeGizmo()
{
DragDelta += new DragDeltaEventHandler(this.ResizeGizmo_DragDelta);
}
private void ResizeGizmo_DragDelta(object sender, DragDeltaEventArgs e)
{
float MinSize = 70;
NodeViewModel node = this.DataContext as NodeViewModel;
var element = sender as FrameworkElement;
if (node != null)
{
double deltaVertical, deltaHorizontal;
switch (VerticalAlignment)
{
case VerticalAlignment.Bottom:
deltaVertical = Math.Min(-e.VerticalChange, node.Height - MinSize);
node.Height -= deltaVertical;
break;
case VerticalAlignment.Top:
deltaVertical = Math.Min(e.VerticalChange, node.Height - MinSize);
node.Y += deltaVertical;
node.Height -= deltaVertical;
break;
default:
break;
}
switch (HorizontalAlignment)
{
case HorizontalAlignment.Left:
deltaHorizontal = Math.Min(e.HorizontalChange, node.Height - MinSize);
node.X += deltaHorizontal;
node.Width -= deltaHorizontal;
break;
case HorizontalAlignment.Right:
deltaHorizontal = Math.Min(-e.HorizontalChange, node.Height - MinSize);
node.Width -= deltaHorizontal;
break;
default:
break;
}
}
e.Handled = true;
}
}
}
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