I have a user control that contains two text boxes, as well as some other controls. I want to be able to drag/drop a complex type onto this control, and I want the entire control to be a drop target, including the textboxes and space around the composited controls. When the data is dropped, it is split apart into component fields, each represented by the controls in the user control.
我有一个用户控件，包含两个文本框，以及一些其他控件。我希望能够将复杂类型拖放到此控件上，并且我希望整个控件成为放置目标，包括合成控件周围的文本框和空间。删除数据后，它将拆分为组件字段，每个组件字段由用户控件中的控件表示。
The problem I am having is that the textboxes (if I set AllowDrop to true) are trying to do their own drag drop thing, and will individually accept only the text format of the drop data. If I set AllowDrop to false on the textboxes, the drop is disabled the for the textboxes altogether. I can drag my complex data to labels, checkboxes etc, and it behaves exactly like I expect it should.
我遇到的问题是文本框（如果我将AllowDrop设置为true）正在尝试执行自己的拖放操作，并且将仅单独接受放置数据的文本格式。如果我在文本框中将AllowDrop设置为false，则完全禁用文本框的删除。我可以将我的复杂数据拖到标签，复选框等，它的行为与我期望的完全一样。
In addition the space around the other controls does not seem to be considered a valid drop target.
此外，其他控件周围的空间似乎不被视为有效的放置目标。
Any ideas how to make the text boxes behave as the controls (such as the labels, checkbox or combobox), and why the grid is not being considered a valid drop target?
任何想法如何使文本框作为控件（如标签，复选框或组合框），以及为什么网格不被视为有效的放置目标？
Source for the user control:
用户控件的来源：
<UserControl x:Class="DragDropTester.CompositeControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="226" d:DesignWidth="428" AllowDrop="True">
<Grid AllowDrop="True">
<TextBox Height="23" Margin="115,12,12,0" Name="textBox1" VerticalAlignment="Top" AllowDrop="False" />
<Label Content="TextBox 1:" Height="28" HorizontalAlignment="Left" Margin="12,12,0,0" Name="label1" VerticalAlignment="Top" Width="97" />
<TextBox Height="23" Margin="115,41,12,0" Name="textBox2" VerticalAlignment="Top" AllowDrop="False" />
<Label Content="TextBox 2:" Height="28" HorizontalAlignment="Left" Margin="12,41,0,0" Name="label2" VerticalAlignment="Top" Width="97" />
<CheckBox Content="CheckBox" Height="16" Margin="115,70,150,0" Name="checkBox1" VerticalAlignment="Top" />
<ComboBox Height="23" Margin="115,92,12,0" Name="comboBox1" VerticalAlignment="Top" />
</Grid>
</UserControl>
and code behind:
和代码背后：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace DragDropTester {
/// <summary>
/// Interaction logic for CompositeControl.xaml
/// </summary>
public partial class CompositeControl : UserControl {
public CompositeControl() {
InitializeComponent();
PreviewDragEnter += new DragEventHandler(CompositeControl_DragEnter);
this.PreviewDragOver += new DragEventHandler(CompositeControl_DragEnter);
Drop += new DragEventHandler(CompositeControl_Drop);
}
void CompositeControl_Drop(object sender, DragEventArgs e) {
var complex = e.Data.GetData("ComplexDragData") as ComplexDragData;
if (complex != null) {
this.textBox1.Text = complex.Text1;
this.textBox2.Text = complex.Text2;
this.checkBox1.IsChecked = complex.BoolValue;
}
}
void CompositeControl_DragEnter(object sender, DragEventArgs e) {
var complex = e.Data.GetData("ComplexDragData") as ComplexDragData;
if (complex != null) {
e.Effects = DragDropEffects.Link;
} else {
e.Effects = DragDropEffects.None;
}
e.Handled = true;
}
}
}
And for the main window that hosts the user control and a drag source...
对于托管用户控件的主窗口和拖动源...
XAML:
XAML：
<Window x:Class="DragDropTester.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:src="clr-namespace:DragDropTester"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="40" />
</Grid.RowDefinitions>
<src:CompositeControl />
<Label Content="Drag Source" Grid.Row="1" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Margin="5" Background="LightGray" Name="lblDragSource" />
</Grid>
</Window>
C# code behind:
C＃代码背后：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace DragDropTester {
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window {
private Point _startPoint;
private bool _IsDragging;
public MainWindow() {
InitializeComponent();
lblDragSource.PreviewMouseLeftButtonDown += new MouseButtonEventHandler(lblDragSource_PreviewMouseLeftButtonDown);
lblDragSource.PreviewMouseMove += new MouseEventHandler(lblDragSource_PreviewMouseMove);
}
void lblDragSource_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) {
_startPoint = e.GetPosition(sender as IInputElement);
}
void lblDragSource_PreviewMouseMove(object sender, MouseEventArgs e) {
if (_startPoint == null) {
return;
}
if (e.LeftButton == MouseButtonState.Pressed && !_IsDragging) {
Point position = e.GetPosition(sender as IInputElement);
if (Math.Abs(position.X - _startPoint.X) > SystemParameters.MinimumHorizontalDragDistance || Math.Abs(position.Y - _startPoint.Y) > SystemParameters.MinimumVerticalDragDistance) {
StartDrag(sender as DependencyObject);
}
}
}
private void StartDrag(DependencyObject dragSource) {
var data = new DataObject();
var dragData = new ComplexDragData { Text1 = "This is text1", Text2 = "This is text2", BoolValue = true };
data.SetData("ComplexDragData", dragData);
data.SetData(DataFormats.Text, dragData.ToString());
try {
_IsDragging = true;
DragDrop.DoDragDrop(dragSource, data, DragDropEffects.Copy | DragDropEffects.Link);
} finally {
_IsDragging = false;
}
}
}
public class ComplexDragData {
public String Text1 { get; set; }
public String Text2 { get; set; }
public bool BoolValue { get; set; }
public override string ToString() {
return string.Format("text1: {0} text2: {1} Bool: {2}", Text1, Text2, BoolValue );
}
}
}
1 个解决方案
#1
4
Its looks like I can get the behavior I want by hooking the drag/drop events of the text boxes individually:
看起来我可以通过单独挂钩文本框的拖放事件来获得我想要的行为：
public CompositeControl() {
InitializeComponent();
PreviewDragEnter += new DragEventHandler(CompositeControl_DragEnter);
PreviewDragOver += new DragEventHandler(CompositeControl_DragEnter);
textBox1.PreviewDragEnter += new DragEventHandler(textBox_PreviewDragEnter);
textBox1.PreviewDragOver += new DragEventHandler(textBox_PreviewDragEnter);
textBox1.PreviewDrop += new DragEventHandler(CompositeControl_Drop);
textBox2.PreviewDragEnter += new DragEventHandler(textBox_PreviewDragEnter);
textBox2.PreviewDragOver += new DragEventHandler(textBox_PreviewDragEnter);
textBox2.PreviewDrop += new DragEventHandler(CompositeControl_Drop);
Drop += new DragEventHandler(CompositeControl_Drop);
}
void textBox_PreviewDragEnter(object sender, DragEventArgs e) {
e.Handled = true;
}
#1
4
Its looks like I can get the behavior I want by hooking the drag/drop events of the text boxes individually:
看起来我可以通过单独挂钩文本框的拖放事件来获得我想要的行为：
public CompositeControl() {
InitializeComponent();
PreviewDragEnter += new DragEventHandler(CompositeControl_DragEnter);
PreviewDragOver += new DragEventHandler(CompositeControl_DragEnter);
textBox1.PreviewDragEnter += new DragEventHandler(textBox_PreviewDragEnter);
textBox1.PreviewDragOver += new DragEventHandler(textBox_PreviewDragEnter);
textBox1.PreviewDrop += new DragEventHandler(CompositeControl_Drop);
textBox2.PreviewDragEnter += new DragEventHandler(textBox_PreviewDragEnter);
textBox2.PreviewDragOver += new DragEventHandler(textBox_PreviewDragEnter);
textBox2.PreviewDrop += new DragEventHandler(CompositeControl_Drop);
Drop += new DragEventHandler(CompositeControl_Drop);
}
void textBox_PreviewDragEnter(object sender, DragEventArgs e) {
e.Handled = true;
}