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                ## 2.1按鈕 FLTK提供了很多類型的按鈕 | Fl_Button | 普通按鈕 | |:--- |:--- | | Fl_Check_Button | 帶有選擇框的按鈕 | | Fl_Light_Button | 帶有指示燈的按鈕 | | Fl_Repeat_Button | | | Fl_Return_Button | 能被Enter激活的按鈕 | | Fl_Round_Button | 帶有圓形選擇框的按鈕 | 每一個按鈕都需要相應的`<FL/Fl_xyz_Button.H>`頭文件。 構造函數包含了控件的位置,大小和可選的標簽 ``` Fl_Button *button = new Fl_Button(x, y, width, height, "label"); Fl_Light_Button *lbutton = new Fl_Light_Button(x, y, width, height); Fl_Round_Button *rbutton = new Fl_Round_Button(x, y, width, height, "label"); ``` 每一個按鈕可以設置自己的類型用type(),通過這個設置,可以讓一個按鈕為 push button, toggle button, or radio button: ``` button->type(FL_NORMAL_BUTTON); lbutton->type(FL_TOGGLE_BUTTON); rbutton->type(FL_RADIO_BUTTON); ``` 對于toggle和radio按鈕,value()函數返回當前的狀態,開/關(0代表關,1代表開),set()和clear()分別用來設置和清除togglebutton的狀態。Radio Button可以用setonly()打開,同組中的其他Radio button按鈕將關閉。
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