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SWT中獲取字符串占用像素數

Posted on 2006-12-29 11:21 Hexise 閱讀(2311) 評論(0) 編輯收藏所屬分類: SWT/JFace

可以使用GC類的getAdvanceWidth(char ch)獲取當前字符所占的像素寬度.

getAdvanceWidth

????????? public int getAdvanceWidth(char?ch)

Returns the advance width of the specified character in the font which is currently selected into the receiver.

The advance width is defined as the horizontal distance the cursor should move after printing the character in the selected font.

Parameters:

ch - the character to measure

Returns:

the distance in the x direction to move past the character before painting the next

Throws:

SWTException -

ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed

可以如下面的程序使用該函數:

public?static?int?getStringWidth(String?string,?Control?control)?{

??? int?width?=?0;

????GC?gc?=?new?GC(control);

?? ?for?(int?i?=?0;?i?<?string.length();?i++)?{

????????char?c?=?string.charAt(i);

????????width?+=?gc.getAdvanceWidth(c);

????}

????gc.dispose();

????return?width;

}

或者更通用的,其中string是目標字符串,font是你要設給字符串的字體對象:

public?static?int?getStringWidth(String?string,?Font?font){

????int?width?=?0;

????Shell?shell?=?new?Shell();

????Label?label?=?new?Label(shell,?SWT.NONE);

????label.setFont(font);

????GC?gc?=?new?GC(label);

????for(int?i=0;i<string.length();i++){

??????????char?c?=?string.charAt(i);

??????????width?+=?gc.getAdvanceWidth(c);