java - Weird behavior of GridBagLayout -


i've discovered strange thing in code:

import java.awt.color; import java.awt.container; import java.awt.gridbagconstraints; import java.awt.gridbaglayout; import java.io.ioexception;  import javax.swing.borderfactory; import javax.swing.box; import javax.swing.jcomponent; import javax.swing.jframe; import javax.swing.jlabel; import javax.swing.jpanel; import javax.swing.swingutilities;   public class test {      public static void main(string [] args) throws ioexception {         final jframe frame = new jframe();         frame.setdefaultcloseoperation(jframe.exit_on_close);          jpanel panel = new jpanel();         panel.setlayout(new gridbaglayout());          gridbagconstraints gbc = new gridbagconstraints();          gbc.insets.top = 5;         gbc.insets.right = 5;          add(0, 0, 1, 1, 2, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(2, 0, 1, 1, 2, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(0, 1, 1, 1, 2, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(2, 1, 1, 1, 2, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(0, 2, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(1, 2, 1, 1, 2, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(3, 2, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(0, 3, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(1, 3, 1, 1, 2, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(3, 3, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(0, 4, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(1, 4, 1, 1, 2, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(3, 4, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());         add(0, 5, 1, 1, 4, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, panel, createpanel());          frame.setcontentpane(panel);          swingutilities.invokelater(new runnable() {             @override             public void run() {                 frame.pack();                 frame.setlocationrelativeto(null);                 frame.setvisible(true);             }         });     }      private static void add(int gridx, int gridy, int weightx, int weighty, int gridw, int gridh, int fill, int anchor, gridbagconstraints gbc, container container, jcomponent component) {         gbc.gridx = gridx;         gbc.gridy = gridy;         gbc.weightx = weightx;         gbc.weighty = weighty;         gbc.gridwidth = gridw;         gbc.gridheight = gridh;         gbc.fill = fill;         gbc.anchor = anchor;          component.add(box.createhorizontalstrut(5));         component.add(new jlabel("(" + gridx + "; " + gridy + ")"));         component.add(box.createhorizontalstrut(5));         component.add(new jlabel("gridwidth = " + gridw));         component.add(box.createhorizontalstrut(5));          container.add(component, gbc);     }      private static jpanel createpanel() {         jpanel panel1 = new jpanel();         panel1.setbackground(color.white);         panel1.setborder(borderfactory.createlineborder(color.red));          return panel1;     } }

and how looks on run:

java_weird

there coordinates in brackets , gridwidth of each panel. can see last row, global gridwidth 4. rows 3-5 (y=2, y=3, y=4) in column 1 (x=0) have gridwidth equal 1. in first 2 rows first column has gridwidth equal 2, , supposed divided in middle of frame, isn't. why?

what found myself:

public class test {      public static void main(string [] args) throws ioexception {         final jframe frame = new jframe();         frame.setdefaultcloseoperation(jframe.exit_on_close);          jpanel panel = new jpanel();         panel.setlayout(new boxlayout(panel, boxlayout.y_axis));          gridbagconstraints gbc = new gridbagconstraints();          gbc.insets.top = 5;         gbc.insets.right = 5;          jpanel toppanel = new jpanel();         toppanel.setlayout(new gridbaglayout());         jpanel bottompanel = new jpanel();         bottompanel.setlayout(new gridbaglayout());          add(0, 0, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, toppanel, createpanel());         add(1, 0, 1, 1, 2, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, toppanel, createpanel());         add(0, 0, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, bottompanel, createpanel());         add(1, 0, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, bottompanel, createpanel());         add(2, 0, 1, 1, 1, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, bottompanel, createpanel());         add(0, 2, 1, 1, 3, 1, gridbagconstraints.both, gridbagconstraints.center, gbc, bottompanel, createpanel());          panel.add(toppanel);         panel.add(bottompanel);          frame.setcontentpane(panel);          swingutilities.invokelater(new runnable() {             @override             public void run() {                 frame.pack();                 frame.setlocationrelativeto(null);                 frame.setvisible(true);             }         });     }      private static void add(int gridx, int gridy, int weightx, int weighty, int gridw, int gridh, int fill, int anchor, gridbagconstraints gbc, container container, jcomponent component) {         gbc.gridx = gridx;         gbc.gridy = gridy;         gbc.weightx = weightx;         gbc.weighty = weighty;         gbc.gridwidth = gridw;         gbc.gridheight = gridh;         gbc.fill = fill;         gbc.anchor = anchor;          component.add(box.createhorizontalstrut(5));         component.add(new jlabel("(" + gridx + "; " + gridy + ")"));         component.add(box.createhorizontalstrut(5));         component.add(new jlabel("gridwidth = " + gridw));         component.add(box.createhorizontalstrut(5));          container.add(component, gbc);     }      private static jpanel createpanel() {         jpanel panel1 = new jpanel();         panel1.setbackground(color.white);         panel1.setborder(borderfactory.createlineborder(color.red));          return panel1;     } }

result looks like:

java weird

what i've done: divided content pane 2 separate panels - top (with single row has 2 equally divided cells) , bottom (with 2 rows: 1 has 3 cells , has 1 single wide cell). content pane has boxlayout instead of gbl, , works expected. i'm disappointed gridbaglayout, perfect layout me before now.


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