为什么子窗体不与父窗体出现在同一屏幕上？

Question

更新

我接受了 Rufus L 的回答并做了一些修改，相关代码如下

public partial class ClsOfficeRibbonFooTab
{

    private void FooTab_Load(object sender, RibbonUIEventArgs e)
    {
         .
         .
         .
    }

    private void CheckResolution()
    {
        // set the left position so that the expanded version of the form fits on the screen
        Screen screen = Screen.FromHandle(new IntPtr(Globals.ThisAddIn.Application.ActiveWindow.Hwnd));

        if (screen.Bounds.Width < 1360 || screen.Bounds.Height < 768)
        {
            throw new FormatException(String.Format("The {0} is supported on screens with a resolution of 1360 by 768 or greater. Your screen is {1} by {2}", "Some caption text", screen.Bounds.Width, screen.Bounds.Height));
        }
    }

    private void ObjButtonFoo_Click(object sender, RibbonControlEventArgs e)
    {
        using (ClsFormFoo objFormFoo = new ClsFormFoo(parentWindow: Globals.ThisAddIn.Application.ActiveWindow))
        {
            CheckResolution();
            objFormFoo.ShowDialog();
        }
    }
}

public partial class ClsFormFoo : Form
{
    // This form is a fixed dialog with a flyout on the right side. 
    // expandedWidth is a const set to the max width of this fixed dialog (i.e., the dialog with the flyout extended)
    const int expandedWidth = 1345;

    public ClsFormFoo(Microsoft.Office.Interop.Word.Window parentWindow)
    {
        InitializeComponent();
        Top = parentWindow.Top;
    }

    private void ClsFormFoo_Load(object sender, EventArgs e)
    {
        Screen screen = Screen.FromHandle(new IntPtr(Globals.ThisAddIn.Application.ActiveWindow.Hwnd));

        // set the left position so that the expanded version of the form fits on the screen for all legal resolutions
        int halfScreenWidth = (int)(screen.WorkingArea.Width / 2);
        // This form is a fixed dialog with a flyout on the right side. 
        // expandedWidth is a const set to the max width of this fixed dialog (i.e., the dialog with the flyout extended)
        int halfFormWidth = (int)(expandedWidth / 2);
        this.Left = screen.Bounds.Left + ((int)(halfScreenWidth - halfFormWidth));
    }
}

原版Post

我的 VSTO Add-In 提供了一个功能区按钮，单击该按钮会调用 ObjButtonFoo_Click，它又会显示 ClsFormFoo 表单（参见代码以下）。 ObjButtonFoo_Click 包含创建代表 Word 的 IWin32Window 所有者值以传递给 ShowDialog 的代码。

在多显示器设置中，我希望 objFormFoo 会出现在显示 Word 本身的同一台显示器上。但是，当我在辅助监视器上启动 Word 并导致执行 ObjButtonFoo_Click 时，objFormFoo 出现在主监视器上

如何使 objFormFoo 出现在与 Word 本身显示在同一台显示器上，无论它是否是主显示器？

注意：我已验证 winWordMain 已填充，即它不为空。请参阅下面的 winWordMain

代码

private void ObjButtonFoo_Click(object sender, RibbonControlEventArgs e)
{
    NativeWindow winWordMain = new NativeWindow();
    winWordMain.AssignHandle(new IntPtr(Globals.ThisAddIn.Application.ActiveWindow.Hwnd));
    IntPtr(Globals.ThisAddIn.Application.ActiveWindow.Hwnd);

    using (ClsFormFoo objFormFoo = new ClsFormFoo()
    {
        objFormFoo.ShowDialog(winWordMain);
    }

    winWordMain.ReleaseHandle();
}

winWordMain

Answer 1

我没有 VSTO 来测试这个，但在我看来你可以只获取你用作父级的 ActiveWindow 的位置，然后将其用作参考用于定位您的子表单：

private void allRootsWithChilds_CheckedChanged(object sender, EventArgs e)
{
    var winWordMain = new NativeWindow();
    var parent = Globals.ThisAddIn.Application.ActiveWindow;
    winWordMain.AssignHandle(new IntPtr(parent.Hwnd));

    using (var objFormFoo = new ClsFormFoo())
    {
        // Set the Left and Top properties so this form is centered over the parent
        objFormFoo.Left = parent.Left + (parent.Width - objFormFoo.Width) / 2;
        objFormFoo.Top = parent.Top + (parent.Height - objFormFoo.Height) / 2;

        objFormFoo.ShowDialog(winWordMain);
    }

    winWordMain.ReleaseHandle();
}

Answer 2

我以前用C#做一个简单的屏保。我使用以下代码在所需屏幕或所有屏幕上打开屏幕保护程序。

您必须从所需的屏幕中获取 bounds 并将其传递给表单。

// Constructor
public NameForm(Rectangle bounds)
{
    InitializeComponent();

    this.Bounds = bounds;
}

// In my case, this is opening the screensaver on all screens
foreach (Screen screen in Screen.AllScreens)
{
    NameForm form = new NameForm (screen.Bounds);
    form.Show();
}

Answer 3

您只需将表单的 StartPosition 属性设置为 FormStartPosition.CenterParent 值：

loginForm.StartPosition = FormStartPosition.CenterParent;
loginForm.ShowDialog(parentWindowdle);

为什么子窗体不与父窗体出现在同一屏幕上？

Why doesn't the child form appear on the same screen as the parent form?

c#

winforms

vsto

handle

multiple-monitors