about GridBadLayout??

範列1: gridx、gridy

gridxgridy是用以指定元件的相對位置,由範例1可以看出當gridxgridy的值變化時,對於Button的位置的改變,gridxgridy的值是相對的,也就是說gridx值越大的排在越右邊,gridy越大的排在越下面。

 

import java.awt.*;

 

public class Sample1 extends Frame {

  public Sample1() {

    GridBagLayout gridbag = new GridBagLayout();

    GridBagConstraints cons = new GridBagConstraints();

    setLayout(gridbag);

 

    cons.gridy = 3;

    Button btn1 = new Button("Button1");

    gridbag.setConstraints(btn1, cons);

    this.add(btn1);

 

    cons.gridy = 2;

    cons.gridx = 4;

    Button btn2 = new Button("Button2");

    gridbag.setConstraints(btn2, cons);

    this.add(btn2);

 

    cons.gridy = 2;

    cons.gridx = 1;

    Button btn3 = new Button("Button3");

    gridbag.setConstraints(btn3, cons);

    this.add(btn3);

 

    cons.gridy = 4;

    Button btn4 = new Button("Button4");

    gridbag.setConstraints(btn4, cons);

    this.add(btn4);

 

    this.setSize(300, 500);

    this.pack();

    this.show();

  }

  public static void main(String[] args) {

    Sample1 sample11 = new Sample1();

  }

}

 

Sample1執行結果

 

    範例2: gridwidthgridheightfill

gridwidthgridheight是用來指定元件的相對大小,由範例2可以看出,當gridwidthgridheight變化時,元件大小的變化。cons.fill = GridBagConstraints.BOTH是指元件將剩餘空間填滿的意思。

 

import java.awt.*;

 

public class Sample2 extends Frame {

 

  public Sample2() {

    GridBagLayout gridbag = new GridBagLayout();

    GridBagConstraints cons = new GridBagConstraints();

    setLayout(gridbag);

 

    cons.fill = GridBagConstraints.BOTH;

 

    cons.gridy = 1;

    cons.gridwidth = 1;

    Button btn1 = new Button("Button1");

    gridbag.setConstraints(btn1, cons);

    this.add(btn1);

 

    cons.gridwidth = 2;

    Button btn2 = new Button("Button2");

    gridbag.setConstraints(btn2, cons);

    this.add(btn2);

 

    cons.gridy = 2;

    cons.gridwidth = 1;

    Button btn3 = new Button("Button3");

    gridbag.setConstraints(btn3, cons);

    this.add(btn3);

 

    Button btn4 = new Button("Button4");

    gridbag.setConstraints(btn4, cons);

    this.add(btn4);

 

    Button btn5 = new Button("Button5");

    gridbag.setConstraints(btn5, cons);

    this.add(btn5);

 

    cons.gridy = 1;

    cons.gridheight = 2;

    Button btn6 = new Button("Button6");

    gridbag.setConstraints(btn6, cons);

    this.add(btn6);

 

    this.pack();

    this.show();

  }

  public static void main(String[] args) {

    Sample2 sample21 = new Sample2();

  }

}

 

Sample2執行結果

 

    範例3: weightxwieghty

weightxweighty設定的是權值,是當外框大小改變時,其內元件變化的倍數值,當weightxweighty值為0時,元件不會改變大小,如果值大於0則與其它也大於0的元件比較後,依權值大小決定變化的程度。

試著改變weightxweighty並在程式執行時,透過拖曳改變Frame大小,就可看出weightxweighty對元件大小的影響。

 

import java.awt.*;

 

public class Sample3 extends Frame {

 

  public Sample3() {

    GridBagLayout gridbag = new GridBagLayout();

    GridBagConstraints cons = new GridBagConstraints();

    setLayout(gridbag);

 

    cons.fill = GridBagConstraints.BOTH;

 

    //cons.weightx = 1;

    cons.weighty = 1;

    cons.anchor = GridBagConstraints.EAST;

    cons.gridy = 1;

    cons.gridx = 1;

    Button btn1 = new Button("Button1");

    gridbag.setConstraints(btn1, cons);

    this.add(btn1);

 

    cons.gridy = 1;

    cons.gridx = 2;

    Button btn2 = new Button("Button2");

    gridbag.setConstraints(btn2, cons);

    this.add(btn2);

 

    cons.gridy = 1;

    cons.gridx = 3;

    Button btn3 = new Button("Button3");

    gridbag.setConstraints(btn3, cons);

    this.add(btn3);

 

    cons.gridy = 2;

    cons.gridx = 1;

    cons.weighty = 0.5;

    Button btn4 = new Button("Button4");

    gridbag.setConstraints(btn4, cons);

    this.add(btn4);

 

    cons.gridy = 2;

    cons.gridx = 2;

    cons.weighty = 0;

    Button btn5 = new Button("Button5");

    gridbag.setConstraints(btn5, cons);

    this.add(btn5);

 

    cons.gridy = 3;

    cons.gridx = 1;

    Button btn6 = new Button("Button6");

    gridbag.setConstraints(btn6, cons);

    this.add(btn6);

 

    this.setSize(300, 500);

    this.pack();

    this.show();

  }

  public static void main(String[] args) {

    Sample3 sample31 = new Sample3();

  }

}

 

Sample3執行結果

 

Sample3拖曳後的結果

 

    範例4: anchor

anchor是用以指定在指定範圍裡,如果有空間,元件要靠那邊,可指定的值有GridBagConstraints.EASTGridBagConstraints.WESTGridBagConstraints.SOUTHGridBagConstraints.NORTHGridBagConstraints.CENTER

試著改變範例4anchor值,就可發現Button3的位置的改變。

 

import java.awt.*;

 

public class Sample4 extends Frame {

 

  public Sample4() {

    GridBagLayout gridbag = new GridBagLayout();

    GridBagConstraints cons = new GridBagConstraints();

    setLayout(gridbag);

 

    cons.gridy = 1;

    cons.gridx = 1;

    cons.gridwidth = 1;

    cons.gridheight = 1;

    Button btn1 = new Button("Button1");

    gridbag.setConstraints(btn1, cons);

    this.add(btn1);

 

    cons.gridy = 1;

    cons.gridx = 2;

    cons.gridwidth = 2;

    Button btn2 = new Button("Button2");

    gridbag.setConstraints(btn2, cons);

    this.add(btn2);

 

    //cons.anchor = GridBagConstraints.SOUTH;

    cons.anchor = GridBagConstraints.NORTH;

    cons.gridy = 1;

    cons.gridx = 4;

    cons.gridheight = 2;

    cons.gridwidth = 1;

    Button btn3 = new Button("Button3");

    gridbag.setConstraints(btn3, cons);

    this.add(btn3);

 

    cons.gridy = 2;

    cons.gridx = 2;

    cons.gridheight = 1;

    Button btn4 = new Button("Button4");

    gridbag.setConstraints(btn4, cons);

    this.add(btn4);

 

    this.pack();

    this.show();

  }

  public static void main(String[] args) {

    Sample4 sample41 = new Sample4();

  }

}

 

Sample4執行結果 (cons.anchor = GridBagConstraints.NORTH)

 

Sample4執行結果 (cons.anchor = GridBagConstraints. SOUTH)

 

    範例5: ipadxipady

ipadxipady是用以指定元件最小寬度、高度外,要再加多少? 當指定了ipadxipady後,元件的寬度會是最小寬度加2*ipadx,高度會是最小高度加2*ipady,單位是pixel

 

import java.awt.*;

 

public class Sample5 extends Frame {

 

  public Sample5() {

    GridBagLayout gridbag = new GridBagLayout();

    GridBagConstraints cons = new GridBagConstraints();

    setLayout(gridbag);

 

    Button btn1 = new Button("Button1");

    gridbag.setConstraints(btn1, cons);

    this.add(btn1);

 

    cons.ipadx = 100;

    cons.ipady = 50;

    Button btn2 = new Button("Button2");

    gridbag.setConstraints(btn2, cons);

    this.add(btn2);

 

    this.pack();

    this.show();

  }

  public static void main(String[] args) {

    Sample5 sample51 = new Sample5();

  }

}

 

你可能感兴趣的:(String,Class,import,button)