[英]WPF: Drag and drop a file into the whole window (titlebar and window borders included)
在WinForms和其他应用程序(例如Windows记事本)中,您可以将(例如文件)拖放到整个窗口中-包括标题栏和窗口边框。
在WPF中,您只能将文件拖到窗口画布中-尝试将其拖到标题栏或窗口边框上会导致“否”光标。
如何使普通的WPF窗口(SingleBorderWindow WindowStyle等)接受拖放到整个窗口中?
区别在于,当您设置AllowDrop =“ true”时,WPF不会调用OS DragAcceptFiles API。 DragAcceptFiles将整个窗口注册为放置目标。
您将需要调用并有一个小的窗口过程来处理放置消息。
这是我制作的一个小测试程序,它允许WPF窗口在任何地方接受放置。
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
const int WM_DROPFILES = 0x233;
[DllImport("shell32.dll")]
static extern void DragAcceptFiles(IntPtr hwnd, bool fAccept);
[DllImport("shell32.dll")]
static extern uint DragQueryFile(IntPtr hDrop, uint iFile, [Out] StringBuilder filename, uint cch);
[DllImport("shell32.dll")]
static extern void DragFinish(IntPtr hDrop);
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
var helper = new WindowInteropHelper(this);
var hwnd = helper.Handle;
HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
source.AddHook(WndProc);
DragAcceptFiles(hwnd, true);
}
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (msg == WM_DROPFILES)
{
handled = true;
return HandleDropFiles(wParam);
}
return IntPtr.Zero;
}
private IntPtr HandleDropFiles(IntPtr hDrop)
{
this.info.Text = "Dropped!";
const int MAX_PATH = 260;
var count = DragQueryFile(hDrop, 0xFFFFFFFF, null, 0);
for (uint i = 0; i < count; i++)
{
int size = (int) DragQueryFile(hDrop, i, null, 0);
var filename = new StringBuilder(size + 1);
DragQueryFile(hDrop, i, filename, MAX_PATH);
Debug.WriteLine("Dropped: " + filename.ToString());
}
DragFinish(hDrop);
return IntPtr.Zero;
}
}
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