c# - WinForms から WPF への倍率 API の使用

Question

WinForms で Magnification API を使用しているライブラリを Web で見つけました。うまく機能しています。私はそれを WPF で動作させようとしましたが、うまくいきませんでした。例外やエラーはありませんでした。すべて問題ないようです。私はそれが WPF で動作することを意図したものではないと考え始めています。

WinForms コード:

public class Magnifier : IDisposable
{
    private Form form;
    private IntPtr hwndMag;
    private float magnification;
    private bool initialized;
    private RECT magWindowRect = new RECT();
    private System.Windows.Forms.Timer timer;

    public Magnifier(Form form)
    {
        if (form == null)
            throw new ArgumentNullException("form");

        magnification = 2.0f;
        this.form = form;
        this.form.Resize += new EventHandler(form_Resize);
        this.form.FormClosing += new FormClosingEventHandler(form_FormClosing);

        timer = new Timer();
        timer.Tick += new EventHandler(timer_Tick);

        initialized = NativeMethods.MagInitialize();
        if (initialized)
        {
            SetupMagnifier();
            timer.Interval = NativeMethods.USER_TIMER_MINIMUM;
            timer.Enabled = true;
        }
    }

    void form_FormClosing(object sender, FormClosingEventArgs e)
    {
        timer.Enabled = false;
    }

    void timer_Tick(object sender, EventArgs e)
    {
        UpdateMaginifier();
    }

    void form_Resize(object sender, EventArgs e)
    {
        ResizeMagnifier();
    }

    ~Magnifier()
    {
        Dispose(false);
    }

    protected virtual void ResizeMagnifier()
    {
        if ( initialized && (hwndMag != IntPtr.Zero))
        {
            NativeMethods.GetClientRect(form.Handle, ref magWindowRect);
            // Resize the control to fill the window.
            NativeMethods.SetWindowPos(hwndMag, IntPtr.Zero,
                magWindowRect.left, magWindowRect.top, magWindowRect.right, magWindowRect.bottom, 0);
        }
    }

    public virtual void UpdateMaginifier()
    {
        if ((!initialized) || (hwndMag == IntPtr.Zero))
            return;

        POINT mousePoint = new POINT();
        RECT sourceRect = new RECT();

        NativeMethods.GetCursorPos(ref mousePoint);

        int width = (int)((magWindowRect.right - magWindowRect.left) / magnification);
        int height = (int)((magWindowRect.bottom - magWindowRect.top) / magnification);

        sourceRect.left = mousePoint.x - width / 2;
        sourceRect.top = mousePoint.y - height / 2;


        // Don't scroll outside desktop area.
        if (sourceRect.left < 0)
        {
            sourceRect.left = 0;
        }
        if (sourceRect.left > NativeMethods.GetSystemMetrics(NativeMethods.SM_CXSCREEN) - width)
        {
            sourceRect.left = NativeMethods.GetSystemMetrics(NativeMethods.SM_CXSCREEN) - width;
        }
        sourceRect.right = sourceRect.left + width;

        if (sourceRect.top < 0)
        {
            sourceRect.top = 0;
        }
        if (sourceRect.top > NativeMethods.GetSystemMetrics(NativeMethods.SM_CYSCREEN) - height)
        {
            sourceRect.top = NativeMethods.GetSystemMetrics(NativeMethods.SM_CYSCREEN) - height;
        }
        sourceRect.bottom = sourceRect.top + height;

        if (this.form == null)
        {
            timer.Enabled = false;
            return;
        }

        if (this.form.IsDisposed)
        {
            timer.Enabled = false;
            return;
        }

        // Set the source rectangle for the magnifier control.
        NativeMethods.MagSetWindowSource(hwndMag, sourceRect);

        // Reclaim topmost status, to prevent unmagnified menus from remaining in view. 
        NativeMethods.SetWindowPos(form.Handle, NativeMethods.HWND_TOPMOST, 0, 0, 0, 0,
            (int)SetWindowPosFlags.SWP_NOACTIVATE | (int)SetWindowPosFlags.SWP_NOMOVE | (int)SetWindowPosFlags.SWP_NOSIZE);

        // Force redraw.
        NativeMethods.InvalidateRect(hwndMag, IntPtr.Zero, true);
    }

    public float Magnification
    {
        get { return magnification; }
        set
        {
            if (magnification != value)
            {
                magnification = value;
                // Set the magnification factor.
                Transformation matrix = new Transformation(magnification);
                NativeMethods.MagSetWindowTransform(hwndMag, ref matrix);
            }
        }
    }

    protected void SetupMagnifier()
    {
        if (!initialized)
            return;

        IntPtr hInst;

        hInst = NativeMethods.GetModuleHandle(null);

        // Make the window opaque.
        form.AllowTransparency = true;
        form.TransparencyKey = Color.Empty;
        form.Opacity = 255;

        // Create a magnifier control that fills the client area.
        NativeMethods.GetClientRect(form.Handle, ref magWindowRect);
        hwndMag = NativeMethods.CreateWindow((int)ExtendedWindowStyles.WS_EX_CLIENTEDGE, NativeMethods.WC_MAGNIFIER,
            "MagnifierWindow", (int)WindowStyles.WS_CHILD | (int)MagnifierStyle.MS_SHOWMAGNIFIEDCURSOR |
            (int)WindowStyles.WS_VISIBLE,
            magWindowRect.left, magWindowRect.top, magWindowRect.right, magWindowRect.bottom, form.Handle, IntPtr.Zero, hInst, IntPtr.Zero);

        if (hwndMag == IntPtr.Zero)
        {
            return;
        }

        // Set the magnification factor.
        Transformation matrix = new Transformation(magnification);
        NativeMethods.MagSetWindowTransform(hwndMag, ref matrix);
    }

    protected void RemoveMagnifier()
    {
        if (initialized)
            NativeMethods.MagUninitialize();
    }

    protected virtual void Dispose(bool disposing)
    {
        timer.Enabled = false;
        if (disposing)
            timer.Dispose();
        timer = null;
        form.Resize -= form_Resize;
        RemoveMagnifier();
    }

    #region IDisposable Members

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    #endregion
}

WPF コードでは、Magnifer クラスを変更しました。

public class Magnifier : IDisposable
{
    private Window window;
    private IntPtr hwnd;
    private IntPtr hwndMag;
    private float magnification;
    private bool initialized;
    private RECT magWindowRect = new RECT();
    private DispatcherTimer timer;

    public Magnifier(Window window)
    {
        if (window == null)
            throw new ArgumentNullException("form");

        hwnd = new WindowInteropHelper(window).Handle;
        magnification = 2.0f;
        this.window = window;
        this.window.SizeChanged += form_Resize;
        this.window.Closing += form_FormClosing;

        timer = new DispatcherTimer();
        timer.Tick += timer_Tick;

        initialized = NativeMethods.MagInitialize();
        if (initialized)
        {
            SetupMagnifier();
            timer.Interval = TimeSpan.FromMilliseconds(NativeMethods.USER_TIMER_MINIMUM);
            timer.IsEnabled = true;
        }
    }

    void form_FormClosing(object sender, CancelEventArgs e)
    {
        timer.IsEnabled = false;
    }

    void timer_Tick(object sender, EventArgs e)
    {
        UpdateMaginifier();
    }

    void form_Resize(object sender, RoutedEventArgs e)
    {
        ResizeMagnifier();
    }

    ~Magnifier()
    {
        Dispose(false);
    }

    protected virtual void ResizeMagnifier()
    {
        if (initialized && (hwndMag != IntPtr.Zero))
        {
            NativeMethods.GetClientRect(hwnd, ref magWindowRect);
            // Resize the control to fill the window.
            NativeMethods.SetWindowPos(hwndMag, IntPtr.Zero,
                magWindowRect.left, magWindowRect.top, magWindowRect.right, magWindowRect.bottom, 0);
        }
    }

    public virtual void UpdateMaginifier()
    {
        if ((!initialized) || (hwndMag == IntPtr.Zero))
            return;

        POINT mousePoint = new POINT();
        RECT sourceRect = new RECT();

        NativeMethods.GetCursorPos(ref mousePoint);

        int width = (int)((magWindowRect.right - magWindowRect.left) / magnification);
        int height = (int)((magWindowRect.bottom - magWindowRect.top) / magnification);

        sourceRect.left = mousePoint.x - width / 2;
        sourceRect.top = mousePoint.y - height / 2;


        // Don't scroll outside desktop area.
        if (sourceRect.left < 0)
        {
            sourceRect.left = 0;
        }
        if (sourceRect.left > NativeMethods.GetSystemMetrics(NativeMethods.SM_CXSCREEN) - width)
        {
            sourceRect.left = NativeMethods.GetSystemMetrics(NativeMethods.SM_CXSCREEN) - width;
        }
        sourceRect.right = sourceRect.left + width;

        if (sourceRect.top < 0)
        {
            sourceRect.top = 0;
        }
        if (sourceRect.top > NativeMethods.GetSystemMetrics(NativeMethods.SM_CYSCREEN) - height)
        {
            sourceRect.top = NativeMethods.GetSystemMetrics(NativeMethods.SM_CYSCREEN) - height;
        }
        sourceRect.bottom = sourceRect.top + height;

        if (this.window == null)
        {
            timer.IsEnabled = false;
            return;
        }

        //if (this.window.IsDisposed)
        //{
        //    timer.IsEnabled = false;
        //    return;
        //}

        // Set the source rectangle for the magnifier control.
        NativeMethods.MagSetWindowSource(hwndMag, sourceRect);

        // Reclaim topmost status, to prevent unmagnified menus from remaining in view. 
        NativeMethods.SetWindowPos(hwnd, NativeMethods.HWND_TOPMOST, 0, 0, 0, 0,
            (int)SetWindowPosFlags.SWP_NOACTIVATE | (int)SetWindowPosFlags.SWP_NOMOVE | (int)SetWindowPosFlags.SWP_NOSIZE);

        // Force redraw.
        NativeMethods.InvalidateRect(hwndMag, IntPtr.Zero, true);
    }

    public float Magnification
    {
        get { return magnification; }
        set
        {
            if (magnification != value)
            {
                magnification = value;
                // Set the magnification factor.
                Transformation matrix = new Transformation(magnification);
                NativeMethods.MagSetWindowTransform(hwndMag, ref matrix);
            }
        }
    }

    protected void SetupMagnifier()
    {
        if (!initialized)
            return;

        IntPtr hInst;

        hInst = NativeMethods.GetModuleHandle(null);

        // Make the window opaque.
        //form.AllowTransparency = true; (done in xaml)
        //window.Background = Brushes.Transparent; (done in xaml)
        //window.Opacity = 255;

        // Create a magnifier control that fills the client area.
        NativeMethods.GetClientRect(hwnd, ref magWindowRect);
        hwndMag = NativeMethods.CreateWindow((int)ExtendedWindowStyles.WS_EX_CLIENTEDGE, NativeMethods.WC_MAGNIFIER,
            "MagnifierWindow", (int)WindowStyles.WS_CHILD | (int)MagnifierStyle.MS_SHOWMAGNIFIEDCURSOR |
            (int)WindowStyles.WS_VISIBLE,
            magWindowRect.left, magWindowRect.top, magWindowRect.right, magWindowRect.bottom, hwnd, IntPtr.Zero, hInst, IntPtr.Zero);

        if (hwndMag == IntPtr.Zero)
        {
            return;
        }

        // Set the magnification factor.
        Transformation matrix = new Transformation(magnification);
        NativeMethods.MagSetWindowTransform(hwndMag, ref matrix);
    }

    protected void RemoveMagnifier()
    {
        if (initialized)
            NativeMethods.MagUninitialize();
    }

    protected virtual void Dispose(bool disposing)
    {
        timer.IsEnabled = false;
        //if (disposing)
        //    timer.Dispose();
        timer = null;
        window.SizeChanged -= form_Resize;
        RemoveMagnifier();
    }

    #region IDisposable Members

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    #endregion
}

XAML:

<Window x:Class="WpfApplication11.MagnifierWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MagnifierWindow" Height="350" Width="525" AllowsTransparency="True" WindowStyle="None">

<Window.Background>
    <SolidColorBrush />
</Window.Background>

-クラスを使用するには、フォーム/ウィンドウのコンストラクターで初期化するだけです。

-WPF で行った変更:

「hwnd」フィールドを追加し、Magnifier コンストラクターで初期化しました。
System.Windows.Forms.Timer を System.Windows.Threading.DispatcherTimer に置き換えました。
form.Resize を window.SizeChanged に、form.FormClosing を window.Closing に変更しました。しかし、これは無関係ですよね？
Window に IsDisposed プロパティがないため、UpdateMagnifier() で if (this.window.IsDisposed) をコメントしました。
Dispose() の破棄チェックにコメントを付けました。

・文字数制限のためネイティブメソッドや構造体を追加できませんでした。

助けていただければ幸いです、ありがとう。

c# - WinForms から WPF への倍率 API の使用

2 に答える 2

Related

Reference