java - JScrollPane increases its size -


i have panel divided 2 parts boxlayout.x_axis:

public tabspanel() {         setlayout(new boxlayout(this, boxlayout.x_axis));         add(createleftpanel());         add(createrightpanel()); }

each left , right panels have following structure: outer panel borderlayout, , inner panel in borderlayout.center of outer panel, in turn has boxlayout.y_axis , several components top bottom. right panel has jtextarea jscrollpane 1 of components:

protected jpanel createrightpanel() {         jpanel pane = new jpanel();         pane.setlayout(new borderlayout());          jpanel panel = new jpanel();         panel.setlayout(new boxlayout(panel, boxlayout.y_axis));          jtextarea label = createlabel();          jscrollpane scroll = new jscrollpane(label);         scroll.setmaximumsize(new dimension(500, 200));         panel.add(box.createrigidarea(new dimension(0,106)));         panel.add(scroll);          jpanel panel_buttons = new jpanel();         panel_buttons.setlayout(new boxlayout(panel_buttons, boxlayout.line_axis));         panel_buttons.setalignmentx(component.center_alignment);          font font_text = new font("georgia", font.plain, 20);          jbutton[] buttons = new jbutton[2];         buttons[0] = new jbutton("clear");         buttons[1] = new jbutton("exit");         (int = 0; < buttons.length; i++) {             buttons[i].setmaximumsize(new dimension(120, 40));             buttons[i].setfont(font_text);             panel_buttons.add(buttons[i]);             if (i == 0)                 panel_buttons.add(box.createrigidarea(new dimension(40, 0)));             buttons[i].addactionlistener(new textactionlistener(label));          }          panel.add(box.createrigidarea(new dimension(0,20)));         panel.add(panel_buttons);          pane.add(panel, borderlayout.center);         return pane;     }

when text goes beyond borders, scroll bars appear , can move them , read text. looks ok, when either click place outside scroll pane or move pointer, scroll pane moves left , grows down. doesn't change width, shifts left because area between , right panel's borders increases. accordingly, size of left panel shrinks. when clear text area , again either click or move pointer, normal size.

what reason height grows , left , right margins increase? doing wrong?

update. i've found problem. thing didn't create jtextarea correctly. initialized without parameters:

jtextarea text = new jtextarea("some initial text");

now have rewritten:

jtextarea text = new jtextarea(5,10);

it shifted left 5 mm , not changes height. still not perfect, looks on right track.

thank help!


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