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你如何獲得java中的屏幕寬度?

[英]How do you get the screen width in java?

有誰知道如何在java中獲得屏幕寬度? 我讀了一些關於某些工具包方法的東西,但我不太清楚它是什么。

謝謝,安德魯

java.awt.Toolkit.getDefaultToolkit().getScreenSize()

以下是我使用的兩種方法,它們考慮了多個監視器和任務欄插件。 如果您不需要單獨使用這兩種方法,當然可以避免兩次獲取圖形配置。

static public Rectangle getScreenBounds(Window wnd) {
    Rectangle                           sb;
    Insets                              si=getScreenInsets(wnd);

    if(wnd==null) { 
        sb=GraphicsEnvironment
           .getLocalGraphicsEnvironment()
           .getDefaultScreenDevice()
           .getDefaultConfiguration()
           .getBounds(); 
        }
    else { 
        sb=wnd
           .getGraphicsConfiguration()
           .getBounds(); 
        }

    sb.x     +=si.left;
    sb.y     +=si.top;
    sb.width -=si.left+si.right;
    sb.height-=si.top+si.bottom;
    return sb;
    }

static public Insets getScreenInsets(Window wnd) {
    Insets                              si;

    if(wnd==null) { 
        si=Toolkit.getDefaultToolkit().getScreenInsets(GraphicsEnvironment
           .getLocalGraphicsEnvironment()
           .getDefaultScreenDevice()
           .getDefaultConfiguration()); 
        }
    else { 
        si=wnd.getToolkit().getScreenInsets(wnd.getGraphicsConfiguration()); 
        }
    return si;
    }

工作區域是顯示器的桌面區域,不包括任務欄,停靠窗口和停靠工具欄。

如果你想要的是屏幕的“工作區域”,請使用:

public static int GetScreenWorkingWidth() {
    return java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width;
}

public static int GetScreenWorkingHeight() {
    return java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height;
}

以下代碼應該這樣做(沒試過):

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
gd.getDefaultConfiguration().getBounds().getWidth();

編輯:

對於多個監視器,您應該使用以下代碼(取自java.awt.GraphicsConfigurationjavadoc

  Rectangle virtualBounds = new Rectangle();
  GraphicsEnvironment ge = GraphicsEnvironment.
          getLocalGraphicsEnvironment();
  GraphicsDevice[] gs =
          ge.getScreenDevices();
  for (int j = 0; j < gs.length; j++) { 
      GraphicsDevice gd = gs[j];
      GraphicsConfiguration[] gc =
          gd.getConfigurations();
      for (int i=0; i < gc.length; i++) {
          virtualBounds =
              virtualBounds.union(gc[i].getBounds());
      }
  } 

Toolkit有許多類可以幫助:

  1. getScreenSize - 原始屏幕大小
  2. getScreenInsets - 獲取工具欄,停靠點的大小
  3. getScreenResolution - dpi

我們最終使用1和2來計算可用的最大窗口大小。 要獲得相關的GraphicsConfiguration,我們使用

GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()[0].getDefaultConfiguration();

但可能有更智能的多顯示器解決方案。

OP可能想要這樣的東西:

Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
Toolkit.getDefaultToolkit().getScreenSize().getWidth()

您可以使用AWT Toolkit獲取它。

Toolkit.getScreenSize()

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

如果您需要當前指定某個組件的屏幕分辨率(在該屏幕上可以看到根窗口的大部分內容),您可以使用此答案

檢測某些東西是否在視覺范圍內的好方法是使用

Screen.getScreensForRectangle(x, y, width, height).isEmpty();

這是Lawrence Dol發布的多顯示器解決方案(上圖)的改進。 在他的解決方案中,此代碼考慮了多個監視器和任務欄插件。 包含的函數是: getScreenInsets()getScreenWorkingArea()getScreenTotalArea()

Lawrence Dol版本的變化:

  • 這樣可以避免兩次獲得圖形配置。
  • 添加了獲取總屏幕區域的功能。
  • 為清晰起見,重命名了變量。
  • 添加了Javadoc。

碼:

/**
 * getScreenInsets, This returns the insets of the screen, which are defined by any task bars
 * that have been set up by the user. This function accounts for multi-monitor setups. If a
 * window is supplied, then the the monitor that contains the window will be used. If a window
 * is not supplied, then the primary monitor will be used.
 */
static public Insets getScreenInsets(Window windowOrNull) {
    Insets insets;
    if (windowOrNull == null) {
        insets = Toolkit.getDefaultToolkit().getScreenInsets(GraphicsEnvironment
                .getLocalGraphicsEnvironment().getDefaultScreenDevice()
                .getDefaultConfiguration());
    } else {
        insets = windowOrNull.getToolkit().getScreenInsets(
                windowOrNull.getGraphicsConfiguration());
    }
    return insets;
}

/**
 * getScreenWorkingArea, This returns the working area of the screen. (The working area excludes
 * any task bars.) This function accounts for multi-monitor setups. If a window is supplied,
 * then the the monitor that contains the window will be used. If a window is not supplied, then
 * the primary monitor will be used.
 */
static public Rectangle getScreenWorkingArea(Window windowOrNull) {
    Insets insets;
    Rectangle bounds;
    if (windowOrNull == null) {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        insets = Toolkit.getDefaultToolkit().getScreenInsets(ge.getDefaultScreenDevice()
                .getDefaultConfiguration());
        bounds = ge.getDefaultScreenDevice().getDefaultConfiguration().getBounds();
    } else {
        GraphicsConfiguration gc = windowOrNull.getGraphicsConfiguration();
        insets = windowOrNull.getToolkit().getScreenInsets(gc);
        bounds = gc.getBounds();
    }
    bounds.x += insets.left;
    bounds.y += insets.top;
    bounds.width -= (insets.left + insets.right);
    bounds.height -= (insets.top + insets.bottom);
    return bounds;
}

/**
 * getScreenTotalArea, This returns the total area of the screen. (The total area includes any
 * task bars.) This function accounts for multi-monitor setups. If a window is supplied, then
 * the the monitor that contains the window will be used. If a window is not supplied, then the
 * primary monitor will be used.
 */
static public Rectangle getScreenTotalArea(Window windowOrNull) {
    Rectangle bounds;
    if (windowOrNull == null) {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        bounds = ge.getDefaultScreenDevice().getDefaultConfiguration().getBounds();
    } else {
        GraphicsConfiguration gc = windowOrNull.getGraphicsConfiguration();
        bounds = gc.getBounds();
    }
    return bounds;
}

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