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利用C#編寫一個(gè)窗體全屏與取消全屏的功能

發(fā)布時(shí)間：2020-12-08 14:51:08 來源：億速云 閱讀：555 作者：Leah 欄目：開發(fā)技術(shù)

本篇文章給大家分享的是有關(guān)利用C#編寫一個(gè)窗體全屏與取消全屏的功能，小編覺得挺實(shí)用的，因此分享給大家學(xué)習(xí)，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。

1、首先說明一下我所用的控件及我的項(xiàng)目中控件的名稱，以便大家理解。

顯示視頻的黑框是一個(gè)picturebox即代碼中的VideoPlayWnd，全屏/取消全屏是一個(gè)button即代碼中的button4

2、具體代碼如下：

全屏和取消全屏是一個(gè)按鈕即button4

private Int16 zoom = -1;//用來控制點(diǎn)擊此button4的時(shí)候，是需要全屏還是取消全屏
 //視頻窗口的縮放代碼
  private void button4_Click(object sender, EventArgs e)
  {
   if(zoom<0)
   {
    float w = this.Width - 210; //為了保證左邊的控件不被擋上減了一個(gè)210
    float h = this.Height - 50;//為了底下的按鈕不被擋上，因?yàn)檫€要用到，因此減了50
    this.VideoPlayWnd.Size = Size.Ceiling(new SizeF(w, h));//重新部署視頻框即這個(gè)picturebox空間的長寬
    VideoPlayWnd.Location = new System.Drawing.Point(210, 0);//視頻框的左上角坐標(biāo)，會(huì)發(fā)現(xiàn)與我上邊減去的210一致（大家肯定都理解為什么我就不說了）
    button4.Location = new System.Drawing.Point(795, 0);//不能只有picturebox變了，這個(gè)button的位置也要保證和視頻框同步，所以需要重設(shè)坐標(biāo)
    // button4.BackgroundImage = Image.FromFile(@"E:\lwj\addpersoninfo\addpersoninfo\Resources\退出全屏.png");//絕對路徑（這是我測試的時(shí)候用的）
    button4.BackgroundImage = Image.FromFile(AppDomain.CurrentDomain.BaseDirectory + @"退出全屏.png");//AppDomain.CurrentDomain.BaseDirectory語句可以獲取到你當(dāng)前項(xiàng)目的bin目錄，所以需要把圖片放到對應(yīng)目錄下
    zoom = 1;//全屏之后，再點(diǎn)擊需要取消全屏，因此要改變zoom的值
   }
   else
   { //以下為取消全屏，即還原自己的視頻框和按鈕，具體操作類似全屏，就不細(xì)致注釋了
    VideoPlayWnd.Location = new System.Drawing.Point(495, 360);
    this.VideoPlayWnd.Size = Size.Ceiling(new SizeF(323, 271));
    button4.Location = new System.Drawing.Point(795, 360);
    button4.BackgroundImage = Image.FromFile(AppDomain.CurrentDomain.BaseDirectory + @"全屏.png");
    zoom = -1;//取消全屏后再點(diǎn)擊就要進(jìn)行全屏，因此繼續(xù)設(shè)為-1（保證小于0，以滿足全屏操作的if條件）
   }
  }

以上代碼中的按鈕是給它加了一個(gè)全屏樣式的背景圖片，并在點(diǎn)擊時(shí)切換背景圖片。

補(bǔ)充知識：C# 窗體視頻控件進(jìn)入全屏模式和退出全屏模式

窗體控件進(jìn)入全屏模式和退出全屏模式，視頻播放的時(shí)候用到此功能。

工具類代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace CvNetVideo.Play
{
 class FullScreenHelper
 {
  bool m_bFullScreen = false;
  IntPtr m_OldWndParent = IntPtr.Zero;
  WINDOWPLACEMENT m_OldWndPlacement = new WINDOWPLACEMENT();
  Control m_control = null;
 
  public FullScreenHelper(Control c)
  {
   m_control = c;
  }
  struct POINT
  {
   int x;
   int y;
  };
  struct RECT
  {
   public int left;
   public int top;
   public int right;
   public int bottom;
  };
  //鎖定指定窗口，禁止它更新。同時(shí)只能有一個(gè)窗口處于鎖定狀態(tài)。鎖定指定窗口，禁止它更新。同時(shí)只能有一個(gè)窗口處于鎖定狀態(tài)
  [DllImport("User32.dll")]
  public static extern bool LockWindowUpdate(IntPtr hWndLock);
 
  //函數(shù)來設(shè)置彈出式窗口，層疊窗口或子窗口的父窗口。新的窗口與窗口必須屬于同一應(yīng)用程序
  [DllImport("User32.dll")]
  public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
 
  //函數(shù)設(shè)置指定窗口的顯示狀態(tài)和恢復(fù)，最大化，最小化位置。函數(shù)功能： 函及原型 
  [DllImport("User32.dll")]
  public static extern bool SetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
 
  //函數(shù)將創(chuàng)建指定窗口的線程設(shè)置到前臺，并且激活該窗口。鍵盤輸入轉(zhuǎn)向該窗口，并為用戶改各種可視的記號
  [DllImport("User32.dll")]
  public static extern bool SetForegroundWindow(IntPtr hWnd);
 
  //該函數(shù)返回桌面窗口的句柄。桌面窗口覆蓋整個(gè)屏幕。桌面窗口是一個(gè)要在其上繪制所有的圖標(biāo)和其他窗口的區(qū)域
  [DllImport("User32.dll")]
  public static extern IntPtr GetDesktopWindow();
 
  //函數(shù)名。該函數(shù)返回指定窗口的顯示狀態(tài)以及被恢復(fù)的、最大化的和最小化的窗口位置
  [DllImport("User32.dll")]
  public static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
 
  //是用于得到被定義的系統(tǒng)數(shù)據(jù)或者系統(tǒng)配置信息的一個(gè)專有名詞 
  [DllImport("User32.dll")]
  public static extern int GetSystemMetrics(int nIndex); 
 
  [DllImport("user32.dll", EntryPoint = "GetParent", SetLastError = true)]
  public static extern IntPtr GetParent(IntPtr hWnd);
  [DllImport("user32.dll", CharSet = CharSet.Auto)]
  public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int Width, int Height, int flags);
  [DllImport("user32.dll", CharSet = CharSet.Auto)]
  public static extern System.IntPtr GetForegroundWindow();
  [DllImport("user32")]
  public static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect);
  [DllImport("user32.dll")]
  public static extern uint ScreenToClient(IntPtr hwnd, ref POINT p);
   public void FullScreen(bool flag)
  {
   m_bFullScreen = flag;
   if (!m_bFullScreen)
   {
    LockWindowUpdate(m_control.Handle);
    SetParent(m_control.Handle, m_OldWndParent);
    SetWindowPlacement(m_control.Handle, ref m_OldWndPlacement);
    SetForegroundWindow(m_OldWndParent);
    LockWindowUpdate(IntPtr.Zero);
   }
   else
   {
    GetWindowPlacement(m_control.Handle, ref m_OldWndPlacement);
    int nScreenWidth = GetSystemMetrics(0);
    int nScreenHeight = GetSystemMetrics(1);
    m_OldWndParent = GetParent(m_control.Parent.Handle);
    SetParent(m_control.Handle, GetDesktopWindow());
    WINDOWPLACEMENT wp1 = new WINDOWPLACEMENT();
    wp1.length = (uint)Marshal.SizeOf(wp1);
    wp1.showCmd = 1;
    wp1.rcNormalPosition.left = 0;
    wp1.rcNormalPosition.top = 0;
    wp1.rcNormalPosition.right = nScreenWidth;
    wp1.rcNormalPosition.bottom = nScreenHeight;
    SetWindowPlacement(m_control.Handle, ref wp1);
    SetForegroundWindow(GetDesktopWindow());
    SetForegroundWindow(m_control.Handle);
   }
   m_bFullScreen = !m_bFullScreen;
  }
  struct WINDOWPLACEMENT
  {
   public uint length;
   public uint flags;
   public uint showCmd;
   public POINT ptMinPosition;
   public POINT ptMaxPosition;
   public RECT rcNormalPosition;
  };
 }
}

調(diào)用方式

 /// <summary>
  /// 全屏事件
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void UCVideo_DoubleClick(object sender, EventArgs e)
  {
   //全屏設(shè)置
   //sdlVideo.SDL_MaximizeWindow();
   fullScreenHelper = new CvNetVideo.Play.FullScreenHelper(this);
   fullScreenHelper.FullScreen(true);
   Console.WriteLine("Entrance FullScreen Mode");
  }
  /// <summary>
  /// 按鍵彈起事件
  /// </summary>
  private void UCVideo_KeyUp(object sender, KeyEventArgs e)
  {
   // ESC 退出全屏
   if (e.KeyCode == Keys.Escape&& fullScreenHelper!=null)
   {
    fullScreenHelper.FullScreen(false);
    fullScreenHelper = null;
    Console.WriteLine("Exit FullScreen Mode");
   }   
  }

測試效果圖

利用C#編寫一個(gè)窗體全屏與取消全屏的功能

利用C#編寫一個(gè)窗體全屏與取消全屏的功能

注意：在使用SDL的全屏操作過程中設(shè)置是無效的，播放視頻過程中不能實(shí)現(xiàn)修改。代碼如下：

public void SDL_MaximizeWindow()
  {
   Console.WriteLine("設(shè)置全屏");
 
   SDL.SDL_MaximizeWindow(screen);
   SDL.SDL_SetWindowFullscreen(screen, SDL.SDL_GetWindowFlags(screen));
   SDL.SDL_ShowWindow(screen);
 
   //int width, height;
    獲取最大窗口值
   //SDL2.SDL.SDL_GetWindowMaximumSize(screen, out width, out height);
    設(shè)置最大窗口值
   //if (width>0&&height>0)
   //{
   // SDL2.SDL.SDL_SetWindowMaximumSize(screen, width, height);
   // Console.WriteLine("設(shè)置全屏......成功!width=" + width + ",height=" + height);
   //}
   //else
   //{
   // Console.WriteLine("設(shè)置全屏......失敗!width=" + width + ",height=" + height);
   // SDL2.SDL.SDL_SetWindowMaximumSize(screen, w, h);
   //}
  }

工具代碼功能改進(jìn)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace CvNetVideo.Play
{
 /// <summary>
 /// 定義全屏抽象類
 /// </summary>
 public abstract class FullScreenObject
 {
  public abstract void FullScreen(bool flag);
 }
 /// <summary>
 /// 桌面全屏
 /// </summary>
 public unsafe class FullScreenHelper: FullScreenObject
 {
  bool m_bFullScreen = false;
 
  WINDOWPLACEMENT m_OldWndPlacement = new WINDOWPLACEMENT();
 
  UCVideo m_control = null;
 
  public FullScreenHelper(UCVideo control)
  {
   m_control = control;
  }
 
  private IntPtr m_OldWndParent = IntPtr.Zero;
 
  DockStyle old_docker_style;
  int old_left;
  int old_width;
  int old_height;
  int old_top;
 
  public override void FullScreen(bool flag)
  {
   m_bFullScreen = flag;
   if (!m_bFullScreen)
   {
    #region 方式一：窗體容積改變時(shí)不能全屏，未能解決IE全屏顯示不全問題
    //ShellSDK.LockWindowUpdate(m_control.Handle);
    //ShellSDK.SetParent(m_control.Handle, m_OldWndParent);
    //ShellSDK.SetWindowPlacement(m_control.Handle, ref m_OldWndPlacement);
    //ShellSDK.SetForegroundWindow(m_OldWndParent);
    //ShellSDK.LockWindowUpdate(IntPtr.Zero);
    #endregion
 
    #region 方式二：在容器改變時(shí)可以實(shí)現(xiàn)全屏，未能解決IE全屏顯示不全問題
    // 取消全屏設(shè)置
    m_control.Dock = old_docker_style;
    m_control.Left = old_left;
    m_control.Top = old_top;
    m_control.Width = old_width;
    m_control.Height = old_height;
    ShellSDK.SetParent(m_control.Handle, m_OldWndParent);
    #endregion
   }
   else
   {
    #region 方式一：窗體容積改變時(shí)不能全屏，未能解決IE全屏顯示不全問題
    //ShellSDK.GetWindowPlacement(m_control.Handle, ref m_OldWndPlacement);
    //int nScreenWidth = ShellSDK.GetSystemMetrics(0);
    //int nScreenHeight = ShellSDK.GetSystemMetrics(1);
    //m_OldWndParent = ShellSDK.GetParent(m_control.Handle);
    //ShellSDK.SetParent(m_control.Handle, ShellSDK.GetDesktopWindow());
    //WINDOWPLACEMENT wp1 = new WINDOWPLACEMENT();
    //wp1.length = (uint)Marshal.SizeOf(wp1);
    //wp1.showCmd = 1;
    //wp1.rcNormalPosition.left = 0;
    //wp1.rcNormalPosition.top = 0;
    //wp1.rcNormalPosition.right = Screen.PrimaryScreen.Bounds.Width/*nScreenWidth*/;
    //wp1.rcNormalPosition.bottom = Screen.PrimaryScreen.WorkingArea.Height/* nScreenHeight*/;
    //ShellSDK.SetWindowPlacement(m_control.Handle, ref wp1);
    //ShellSDK.SetForegroundWindow(ShellSDK.GetDesktopWindow());
    //ShellSDK.SetForegroundWindow(m_control.Handle);
    #endregion
 
    #region 方式二：在容器改變時(shí)可以實(shí)現(xiàn)全屏，未能解決IE全屏顯示不全問題
    // 記錄原來的數(shù)據(jù)
    old_docker_style = m_control.Dock;
    old_left = m_control.Left;
    old_width = m_control.Width;
    old_height = m_control.Height;
    old_top = m_control.Top;
    m_OldWndParent = ShellSDK.GetParent(m_control.Handle);
    // 設(shè)置全屏數(shù)據(jù)
    int nScreenWidth = ShellSDK.GetSystemMetrics(0);
    int nScreenHeight = ShellSDK.GetSystemMetrics(1);
    m_control.Dock = DockStyle.None;
    m_control.Left = 0;
    m_control.Top = 0;
    m_control.Width = nScreenWidth;
    m_control.Height = nScreenHeight;
    ShellSDK.SetParent(m_control.Handle, ShellSDK.GetDesktopWindow());
    ShellSDK.SetWindowPos(m_control.Handle, -1, 0, 0, m_control.Right - m_control.Left, m_control.Bottom - m_control.Top, 0);
    #endregion
   }
   m_bFullScreen = !m_bFullScreen;
  }
 
 }
 
 /// <summary>
 /// 在容器內(nèi)部全屏
 /// </summary>
 public class FullScreenInContainerHelper : FullScreenObject
 {
  bool m_bFullScreen = false;
 
  Control m_control = null;
 
  public FullScreenInContainerHelper(Control control)
  {
   m_control = control;
  }
 
  private IntPtr m_OldWndParent = IntPtr.Zero;
  private IntPtr m_father_hwnd;
  private RECT m_rect = new RECT();
 
  public override void FullScreen(bool flag)
  {
   m_bFullScreen = flag;
   if (!m_bFullScreen)
   {
    ShellSDK.SetParent(m_control.Handle, m_father_hwnd);
    ShellSDK.SetWindowPos(m_control.Handle, 0, m_rect.left, m_rect.top, m_rect.right - m_rect.left, m_rect.bottom - m_rect.top, 0);
    ShellSDK.SetForegroundWindow(m_father_hwnd);
   }
   else
   {
    m_father_hwnd = ShellSDK.GetParent(m_control.Handle);
    ShellSDK.GetWindowRect(m_control.Handle, out RECT rect);
    POINT pt = new POINT();
    pt.x = rect.left;
    pt.y = rect.top;
    ShellSDK.ScreenToClient(m_father_hwnd, ref pt);
    rect.right = rect.right - rect.left + pt.x;
    rect.bottom = rect.bottom - rect.top + pt.y;
    rect.left = pt.x;
    rect.top = pt.y;
    m_rect = rect;
    ShellSDK.GetWindowRect(m_father_hwnd, out RECT rect_fature);
    ShellSDK.SetWindowPos(m_control.Handle, 0, 0, 0, rect_fature.right - rect_fature.left, rect_fature.bottom - rect_fature.top, 0);
   }
   m_bFullScreen = !m_bFullScreen;
  }
 }
 
 /// <summary>
 /// Windows系統(tǒng)API-SDK
 /// </summary>
 public class ShellSDK
 {
  //鎖定指定窗口，禁止它更新。同時(shí)只能有一個(gè)窗口處于鎖定狀態(tài)。鎖定指定窗口，禁止它更新。同時(shí)只能有一個(gè)窗口處于鎖定狀態(tài)
  [DllImport("User32.dll")]
  public static extern bool LockWindowUpdate(IntPtr hWndLock);
 
  //函數(shù)來設(shè)置彈出式窗口，層疊窗口或子窗口的父窗口。新的窗口與窗口必須屬于同一應(yīng)用程序
  [DllImport("User32.dll")]
  public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
 
  //函數(shù)設(shè)置指定窗口的顯示狀態(tài)和恢復(fù)，最大化，最小化位置。函數(shù)功能： 函及原型 
  [DllImport("User32.dll")]
  public static extern bool SetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
 
  //函數(shù)將創(chuàng)建指定窗口的線程設(shè)置到前臺，并且激活該窗口。鍵盤輸入轉(zhuǎn)向該窗口，并為用戶改各種可視的記號
  [DllImport("User32.dll")]
  public static extern bool SetForegroundWindow(IntPtr hWnd);
 
  //該函數(shù)返回桌面窗口的句柄。桌面窗口覆蓋整個(gè)屏幕。桌面窗口是一個(gè)要在其上繪制所有的圖標(biāo)和其他窗口的區(qū)域
  [DllImport("User32.dll")]
  public static extern IntPtr GetDesktopWindow();
 
  //函數(shù)名。該函數(shù)返回指定窗口的顯示狀態(tài)以及被恢復(fù)的、最大化的和最小化的窗口位置
  [DllImport("User32.dll")]
  public static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
 
  //是用于得到被定義的系統(tǒng)數(shù)據(jù)或者系統(tǒng)配置信息的一個(gè)專有名詞 
  [DllImport("User32.dll")]
  public static extern int GetSystemMetrics(int nIndex); 
 
  [DllImport("user32.dll", EntryPoint = "GetParent", SetLastError = true)]
  public static extern IntPtr GetParent(IntPtr hWnd);
  [DllImport("user32.dll", CharSet = CharSet.Auto)]
  public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int Width, int Height, int flags);
  [DllImport("user32.dll", CharSet = CharSet.Auto)]
  public static extern System.IntPtr GetForegroundWindow();
  [DllImport("user32")]
  public static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect);
  [DllImport("user32.dll")]
  public static extern uint ScreenToClient(IntPtr hwnd, ref POINT p);
 }
 
 /// <summary>
 /// 圖像區(qū)域?qū)ο?
 /// </summary>
 public struct RECT
 {
  public int left;
  public int top;
  public int right;
  public int bottom;
 }
 
 /// <summary>
 /// 圖像點(diǎn)位位置
 /// </summary>
 public struct POINT
 {
  public int x;
  public int y;
 }
 
 /// <summary>
 /// 圖像窗口對象
 /// </summary>
 public struct WINDOWPLACEMENT
 {
  public uint length;
  public uint flags;
  public uint showCmd;
  public POINT ptMinPosition;
  public POINT ptMaxPosition;
  public RECT rcNormalPosition;
 }
}

以上就是利用C#編寫一個(gè)窗體全屏與取消全屏的功能，小編相信有部分知識點(diǎn)可能是我們?nèi)粘９ぷ鲿?huì)見到或用到的。希望你能通過這篇文章學(xué)到更多知識。更多詳情敬請關(guān)注億速云行業(yè)資訊頻道。

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