C # WPF & WinForms Interop - CenterOwner tidak efektif
Saya sedang mengerjakan aplikasi warisan yang menggunakan WPF dan WinForms untuk UI-nya. WPF membuat sebagian besar tetapi dialog utama aplikasi masih di WinForms.
Sejauh ini saya dapat membuatnya bekerja sama dengan baik (terima kasih kepada System.Windows.Forms.Integration.ElementHost) tetapi saya tidak dapat membuat jendela WPF berpusat pada induk WinForms mereka.
Kode saya terlihat sebagai berikut.
Kontrol WPF (dihosting di ElementHost)
private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
var dialog = new SubWindow();
WindowOwnershipHelper.SetOwner(dialog, this);
dialog.ShowDialog();
}
OwnershipHelper (diambil darihttps://stackoverflow.com/a/36606974/13567181)
Kelas ini menetapkan hubungan 'induk-anak' sehingga dialog bertingkat terbuka pada layar yang sama dan meminimalkan bersama dengan induknya ...
public static class WindowOwnershipHelper
{
public static void SetOwner(Window window, Visual parent)
{
var source = (HwndSource) PresentationSource.FromVisual(parent);
if (source == null)
{
throw new InvalidOperationException("Could not determine parent from visual.");
}
new WindowInteropHelper(window).Owner = source.Handle;
}
}
Masalah yang saya hadapi adalah ketika dialog.ShowDialog () dijalankan, jendela yang baru dibuka sama sekali tidak berpusat di sekitar pemiliknya. Itu ada di suatu tempat di layar tetapi saya tidak begitu mengerti bagaimana itu menentukan lokasinya.
Menariknya, jika saya mengulangi kode ButtonBase_OnClick di dalam kelas SubWindow lagi, jendela baru ini berpusat sempurna di sekitar induk SubWindow -nya .
Dari sudut pandang saya, ini ada hubungannya dengan induk ElementHost dari SubWindow .
Dapatkah seseorang memberi tahu saya tentang cara agar SubWindow berpusat di sekitar induknya tanpa menghitung posisinya secara manual? (mirip dengan inihttps://stackoverflow.com/a/42401001/13567181)
EDIT: Saya baru saja menemukan ini di MSDN - entah bagaimana mirip tapi saya tidak yakin. https://social.msdn.microsoft.com/Forums/vstudio/en-US/05768951-73cf-4daf-b369-0905ca7e5222/centering-wpf-window-on-winforms-owner-window?forum=wpf
Salam hormat, Norbert
Jawaban
Gunakan Application.Run(new MyForm2());
dan kemudian klik tombol untuk membuat WPF Window
yang berpusat pada formulir utama.
public class MyForm2 : Form {
public MyForm2() {
this.Size = new Size(600,600);
this.StartPosition = FormStartPosition.CenterScreen;
Button btn = new Button { Text = "New Window", AutoSize = true, AutoSizeMode = AutoSizeMode.GrowAndShrink };
btn.Click += btn_Click;
Controls.Add(btn);
}
void btn_Click(object sender, EventArgs e) {
var w = new System.Windows.Window();
w.SourceInitialized += w_SourceInitialized;
w.Width = 400.0; // number of actual pixels might be different
w.Height = 400.0; // depending on DPI. My laptop is 120 dpi, so 400.0 -> 400 * 120 / 96 = 500 pixels.
w.Title = "WPF Window";
w.ShowDialog();
}
void w_SourceInitialized(object sender, EventArgs e) {
var w = (System.Windows.Window) sender;
WindowInteropHelper helper = new WindowInteropHelper(w);
//w.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner; does nothing
int GWL_HWNDPARENT = -8;
SetWindowLongInternal(helper.Handle, GWL_HWNDPARENT, this.Handle);
Rectangle r = this.Bounds;
RECT r2 = new RECT();
GetWindowRect(helper.Handle, out r2);
int w2 = r2.Right - r2.Left;
int h2 = r2.Bottom - r2.Top;
int x2 = r.X + (r.Width - w2) / 2;
int y2 = r.Y + (r.Height - h2) / 2;
uint SWP_NOSIZE = 0x0001;
uint SWP_NOZORDER = 0x0004;
uint SWP_NOREDRAW = 0x0008;
uint SWP_NOACTIVATE = 0x0010;
uint SWP_NOCOPYBITS = 0x0100;
uint SWP_NOOWNERZORDER = 0x0200;
uint flags = SWP_NOACTIVATE | SWP_NOCOPYBITS | SWP_NOOWNERZORDER | SWP_NOREDRAW | SWP_NOSIZE | SWP_NOZORDER;
SetWindowPos(helper.Handle, IntPtr.Zero, x2, y2, 0, 0, flags);
}
[StructLayout(LayoutKind.Sequential)]
private struct RECT {
public int Left;
public int Top;
public int Right;
public int Bottom;
}
[DllImport("user32.dll")]
private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
[DllImport("user32.dll", SetLastError=true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int w, int h, uint uFlags);
[DllImport("user32.dll", SetLastError=true)]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
[DllImport("user32.dll", SetLastError=true)]
private static extern int SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
private static int SetWindowLongInternal(IntPtr hWnd, int nIndex, IntPtr dwNewLong) {
if (IntPtr.Size == 4)
return SetWindowLong(hWnd, nIndex, dwNewLong);
return SetWindowLongPtr(hWnd, nIndex, dwNewLong);
}
}
Versi ini menambahkan WPF Button
bahwa ketika diklik menampilkan batas-batas formulir utama.
public class MyForm2 : Form {
public MyForm2() {
this.Size = new Size(600,600);
this.StartPosition = FormStartPosition.CenterScreen;
Button btn = new Button { Text = "New Window", AutoSize = true, AutoSizeMode = AutoSizeMode.GrowAndShrink };
btn.Click += btn_Click;
Controls.Add(btn);
}
void btn_Click(object sender, EventArgs e) {
var w = new System.Windows.Window();
System.Windows.Controls.Button wpfButton = new System.Windows.Controls.Button { Content = "Button" };
wpfButton.Click += wpfButton_Click;
w.SourceInitialized += w_SourceInitialized;
w.Width = 400.0; // number of actual pixels might be different
w.Height = 400.0; // depending on DPI. My laptop is 120 dpi, so 400.0 -> 400 * 120 / 96 = 500 pixels.
w.Title = "WPF Window";
w.Content = wpfButton;
w.ShowDialog();
}
void wpfButton_Click(object sender, System.Windows.RoutedEventArgs e) {
var wpfButton = (System.Windows.Controls.Button) sender;
var wpfWindow = (System.Windows.Window) wpfButton.Parent;
var helper = new WindowInteropHelper(wpfWindow);
int GWL_HWNDPARENT = -8;
IntPtr hwndMainForm = GetWindowLong(helper.Handle, GWL_HWNDPARENT);
RECT r = new RECT();
GetWindowRect(hwndMainForm, out r);
SimpleWindow sw = new SimpleWindow { Handle = helper.Handle };
MessageBox.Show(sw, "x:" + r.Left + " y:" + r.Top + " w:" + (r.Right - r.Left) + " h:" + (r.Bottom - r.Top), "Main Form Bounds");
}
private class SimpleWindow : System.Windows.Forms.IWin32Window {
public IntPtr Handle { get; set; }
}
void w_SourceInitialized(object sender, EventArgs e) {
var w = (System.Windows.Window) sender;
WindowInteropHelper helper = new WindowInteropHelper(w);
//w.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner; does nothing
int GWL_HWNDPARENT = -8;
SetWindowLongInternal(helper.Handle, GWL_HWNDPARENT, this.Handle);
Rectangle r = this.Bounds;
RECT r2 = new RECT();
GetWindowRect(helper.Handle, out r2);
int w2 = r2.Right - r2.Left;
int h2 = r2.Bottom - r2.Top;
int x2 = r.X + (r.Width - w2) / 2;
int y2 = r.Y + (r.Height - h2) / 2;
uint SWP_NOSIZE = 0x0001;
uint SWP_NOZORDER = 0x0004;
uint SWP_NOREDRAW = 0x0008;
uint SWP_NOACTIVATE = 0x0010;
uint SWP_NOCOPYBITS = 0x0100;
uint SWP_NOOWNERZORDER = 0x0200;
uint flags = SWP_NOACTIVATE | SWP_NOCOPYBITS | SWP_NOOWNERZORDER | SWP_NOREDRAW | SWP_NOSIZE | SWP_NOZORDER;
SetWindowPos(helper.Handle, IntPtr.Zero, x2, y2, 0, 0, flags);
}
[StructLayout(LayoutKind.Sequential)]
private struct RECT {
public int Left;
public int Top;
public int Right;
public int Bottom;
}
[DllImport("user32.dll")]
private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
[DllImport("user32.dll", SetLastError=true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int w, int h, uint uFlags);
[DllImport("user32.dll", SetLastError=true)]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
[DllImport("user32.dll", SetLastError=true)]
private static extern int SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
private static int SetWindowLongInternal(IntPtr hWnd, int nIndex, IntPtr dwNewLong) {
if (IntPtr.Size == 4)
return SetWindowLong(hWnd, nIndex, dwNewLong);
return SetWindowLongPtr(hWnd, nIndex, dwNewLong);
}
[DllImport("user32.dll", SetLastError=true)]
private static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);
[DllImport("user32.dll", SetLastError=true)]
private static extern IntPtr GetWindowLong(IntPtr hWnd, int nIndex);
private static IntPtr GetWindowLongInternal(IntPtr hWnd, int nIndex) {
if (IntPtr.Size == 4)
return GetWindowLong(hWnd, (int) nIndex);
return GetWindowLongPtr(hWnd, (int) nIndex);
}
}