源代码
准备
-
通过nuget 获取MouseKeyHook 库
image.png
- 添加Forms和Drawing两个dll的引用
- Native代码 API准备
#region Native
const int SM_XVIRTUALSCREEN = 76;
const int SM_YVIRTUALSCREEN = 77;
const int SM_CXVIRTUALSCREEN = 78;
const int SM_CYVIRTUALSCREEN = 79;
const int SM_CXSCREEN = 0;
const int SM_CYSCREEN = 1;
[DllImport("Magnification.dll")]
public static extern bool MagSetFullscreenTransform(float level, int xOffset, int yOffsety);
[DllImport("Magnification.dll")]
public static extern bool MagGetFullscreenTransform(out float level, out int xOffset, out int yOffsety);
[DllImport("Magnification.dll")]
public static extern bool MagInitialize();
[DllImport("user32.dll")]
public static extern int GetSystemMetrics(int index);
#endregion Native
代码
工具类代码
public static class MagnifierHelper
{
#region Native
const int SM_XVIRTUALSCREEN = 76;
const int SM_YVIRTUALSCREEN = 77;
const int SM_CXVIRTUALSCREEN = 78;
const int SM_CYVIRTUALSCREEN = 79;
const int SM_CXSCREEN = 0;
const int SM_CYSCREEN = 1;
[DllImport("Magnification.dll")]
public static extern bool MagSetFullscreenTransform(float level, int xOffset, int yOffsety);
[DllImport("Magnification.dll")]
public static extern bool MagGetFullscreenTransform(out float level, out int xOffset, out int yOffsety);
[DllImport("Magnification.dll")]
public static extern bool MagInitialize();
[DllImport("user32.dll")]
public static extern int GetSystemMetrics(int index);
#endregion Native
const int GAP = 100;
static float _magnificationFactor = 2f;
private static IKeyboardMouseEvents m_GlobalHook;
public static float MagnificationFactor
{
get { return _magnificationFactor; }
set
{
if (value < 1)
{
value = 1;
}
if (value > 1)
{
IsZoomed = true;
}
else
{
IsZoomed = false;
}
_magnificationFactor = value;
}
}
private static Rectangle _boundary;
private static int _virtualLeft = 0;
private static int _virtualTop = 0;
private static int _virtualOffsetX = 0;
private static int _virtualOffsetY = 0;
private static bool _magInitialized = false;
public static bool MagInitialized
{
get { return _magInitialized; }
private set
{
_magInitialized = value;
}
}
#region FullProperty IsZoomed
private static bool _isZoomed;
public static bool IsZoomed
{
get { return _isZoomed; }
set { _isZoomed = value; }
}
#endregion FullProperty IsZoomed
static MagnifierHelper()
{
int left = GetSystemMetrics(SM_XVIRTUALSCREEN);
int top = GetSystemMetrics(SM_YVIRTUALSCREEN);
int width = GetSystemMetrics(SM_CXVIRTUALSCREEN);
int height = GetSystemMetrics(SM_CYVIRTUALSCREEN);
_virtualLeft = left;
_virtualTop = top;
var offsetX = left - left / _magnificationFactor;
var offsetY = top - top / _magnificationFactor;
_virtualOffsetX = (int)offsetX;
_virtualOffsetY = (int)offsetY;
_boundary = new Rectangle(left, top, width, height);
MagInitialized = MagInitialize();
Subscribe();
}
private static void SetZoom(int offsetX, int offsetY)
{
if (_magnificationFactor < 1.0)
{
return;
}
App.Current.Dispatcher.BeginInvoke((Action)(() =>
{
MagSetFullscreenTransform(_magnificationFactor, offsetX, offsetY);
}));
}
// 此方法必须使用ui线程执行
public static void ZoomIn(float factor)
{
MagnificationFactor = factor;
int xDlg = (int)((float)GetSystemMetrics(
SM_CXSCREEN) * (1.0 - (1.0 / _magnificationFactor)) / 2.0);
int yDlg = (int)((float)GetSystemMetrics(
SM_CYSCREEN) * (1.0 - (1.0 / _magnificationFactor)) / 2.0);
//SetZoom(_virtualOffsetX, _virtualOffsetY);
SetZoom(xDlg, yDlg);
}
/// <summary>
/// 取消放大
/// </summary>
public static void ZoomOut()
{
QuitMagnify();
}
private static void QuitMagnify()
{
MagnificationFactor = 1;
SetZoom(0, 0);
}
private static void Subscribe()
{
m_GlobalHook = Hook.GlobalEvents();
m_GlobalHook.MouseMove += M_GlobalHook_MouseMove;
}
private static Rectangle GetVisibleRegion()
{
Rectangle rect = new Rectangle();
float level;
int xOffset;
int yOffset;
bool ret1 = MagGetFullscreenTransform(out level, out xOffset, out yOffset);
var transformWidth = (int)(_boundary.Width / level);
var transformHeight = (int)(_boundary.Height / level);
rect.X = xOffset - _virtualOffsetX;
rect.Y = yOffset - _virtualOffsetY;
rect.Width = transformWidth;
rect.Height = transformHeight;
return rect;
}
private static Rectangle GetEdgeRegion()
{
var visibleRegion = GetVisibleRegion();
visibleRegion.X += GAP;
visibleRegion.Y += GAP;
visibleRegion.Width -= 2 * GAP;
visibleRegion.Height -= 2 * GAP;
return visibleRegion;
}
private static void M_GlobalHook_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
//return;
if (!IsZoomed)
{
return;
}
var visibleRegion = GetVisibleRegion();
var edgeRegion = GetEdgeRegion();
float level;
int xOffset;
int yOffset;
bool ret1 = MagGetFullscreenTransform(out level, out xOffset, out yOffset);
if (level <= 1)
{
return;
}
var point = e.Location;
point.X -= _virtualLeft;
point.Y -= _virtualTop;
// 左侧
if (point.X < edgeRegion.X)
{
if (xOffset >= _boundary.Left)
{
xOffset -= 5;
if (xOffset < _virtualOffsetX)
{
xOffset = _virtualOffsetX;
}
}
}
// 上侧
if (point.Y < edgeRegion.Y)
{
if (yOffset >= _virtualOffsetY)
{
yOffset -= 5;
if (yOffset < _virtualOffsetY)
{
yOffset = _virtualOffsetY;
}
}
}
// 右侧
if (point.X > edgeRegion.Right)
{
xOffset += 5;
}
// 下侧
if (point.Y > edgeRegion.Bottom)
{
yOffset += 5;
}
var maxX = (int)(_boundary.Width - _boundary.Width / level) + _virtualOffsetX;
var maxY = (int)(_boundary.Height - _boundary.Height / level) + _virtualOffsetY;
if (xOffset > maxX)
{
xOffset = maxX;
}
if (yOffset > maxY)
{
yOffset = maxY;
}
SetZoom(xOffset, yOffset);
}
public static void Dispose()
{
m_GlobalHook.MouseMove -= M_GlobalHook_MouseMove;
m_GlobalHook.Dispose();
}
//private static void SetInputStream()
//{
// float level;
// int xOffset;
// int yOffset;
// bool ret1 = MagGetFullscreenTransform(out level, out xOffset, out yOffset);
// if ()
//}
}
调用代码
MagnifierHelper.ZoomIn(2.0f);
MagnifierHelper.ZoomOut();
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