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CefSharp在高DPI的屏幕上出现黑边(winform)

作者:互联网

目录

 


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问题现象

如图所示:在高DPI(168) 缩放比例为:175%的配置下,,cefsharp控件的左侧和上部出现黑边

(电脑配置图)

 

(问题图)

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解决办法

1.将cefsharp的gpu设置为无效,(后遗症,h5动画会出现卡顿现象,慎用)

var settings = new CefSettings();
settings.Locale = "zh-CN";
settings.CefCommandLineArgs.Add("disable-gpu", "1");

Cef.Initialize(settings);

2.将屏幕的DPI置为96(缩放比例为100%)(后遗症,不可能每个电脑都去配置)

3.支持高DPI(后遗症,winform窗体会缩放)

Cef.EnableHighDPISupport();

4.(采用)让整个程序支持高DPI

(1)为项目添加应用程序清单文件(app.manifest),并取消下面行的注释

<application xmlns="urn:schemas-microsoft-com:asm.v3">
<windowsSettings>
<dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>
</windowsSettings>
</application>

(2)将Form和UserControl的AutoScaleMode设置为Dpi

如果你做了窗体自适应(根据控件的固定大小,按照拉伸比例来拉伸),还需要以下步骤:

(3)添加获取DPI和缩放比例的帮助类(因为网上出处太多了,这里就不写引用了)

 View Code
public class PrimaryScreenHelper
    {
        #region Win32 API  
        [DllImport("user32.dll")]
        static extern IntPtr GetDC(IntPtr ptr);
        [DllImport("gdi32.dll")]
        static extern int GetDeviceCaps(
        IntPtr hdc, // handle to DC  
        int nIndex // index of capability  
        );
        [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
        static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);
        #endregion
        #region DeviceCaps常量  
        const int HORZRES = 8;
        const int VERTRES = 10;
        const int LOGPIXELSX = 88;
        const int LOGPIXELSY = 90;
        const int DESKTOPVERTRES = 117;
        const int DESKTOPHORZRES = 118;
        #endregion

        #region 属性  
        /// <summary>  
        /// 获取屏幕分辨率当前物理大小  
        /// </summary>  
        public static Size WorkingArea
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                Size size = new Size();
                size.Width = GetDeviceCaps(hdc, HORZRES);
                size.Height = GetDeviceCaps(hdc, VERTRES);
                ReleaseDC(IntPtr.Zero, hdc);
                return size;
            }
        }
        /// <summary>  
        /// 当前系统DPI_X 大小 一般为96  
        /// </summary>  
        public static int DpiX
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int DpiX = GetDeviceCaps(hdc, LOGPIXELSX);
                ReleaseDC(IntPtr.Zero, hdc);
                return DpiX;
            }
        }
        /// <summary>  
        /// 当前系统DPI_Y 大小 一般为96  
        /// </summary>  
        public static int DpiY
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int DpiX = GetDeviceCaps(hdc, LOGPIXELSY);
                ReleaseDC(IntPtr.Zero, hdc);
                return DpiX;
            }
        }
        /// <summary>  
        /// 获取真实设置的桌面分辨率大小  
        /// </summary>  
        public static Size DESKTOP
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                Size size = new Size();
                size.Width = GetDeviceCaps(hdc, DESKTOPHORZRES);
                size.Height = GetDeviceCaps(hdc, DESKTOPVERTRES);
                ReleaseDC(IntPtr.Zero, hdc);
                return size;
            }
        }

        /// <summary>  
        /// 获取宽度缩放百分比  
        /// </summary>  
        public static float ScaleX
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int t = GetDeviceCaps(hdc, DESKTOPHORZRES);
                int d = GetDeviceCaps(hdc, HORZRES);
                float ScaleX = (float)GetDeviceCaps(hdc, DESKTOPHORZRES) / (float)GetDeviceCaps(hdc, HORZRES);
                ReleaseDC(IntPtr.Zero, hdc);
                return ScaleX;
            }
        }
        /// <summary>  
        /// 获取高度缩放百分比  
        /// </summary>  
        public static float ScaleY
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                float ScaleY = (float)(float)GetDeviceCaps(hdc, DESKTOPVERTRES) / (float)GetDeviceCaps(hdc, VERTRES);
                ReleaseDC(IntPtr.Zero, hdc);
                return ScaleY;
            }
        }

        /// <summary>
        /// 获取高DPI下屏幕的缩放比例
        /// </summary>
        public static float ScalePercent
        {
            get { return DpiX / 96.0F; }
        }
        #endregion
    }

  

 

(4)UserControl回复为缩放前的大小

 this.lblClassTime.Location = new System.Drawing.Point((int)(8 * PrimaryScreenHelper.ScalePercent), (int)(75 * PrimaryScreenHelper.ScalePercent));
            this.lblClassTime.Size = new System.Drawing.Size((int)(285 * PrimaryScreenHelper.ScalePercent), (int)(22 * PrimaryScreenHelper.ScalePercent));

标签:GetDeviceCaps,IntPtr,CefSharp,int,Zero,hdc,DPI,winform
来源: https://www.cnblogs.com/tianciliangen/p/11102484.html