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                [TOC] ## 概述 ![](https://qtguide.ustclug.org/images/ch06/ch06-05-01.png) ### 設計器修改 修改控件 舉例:以三個按鈕控件為例 1. 如果它們的伸展因子都是 0,那么三個按鈕在水平布局里就是均勻拉伸 2. "One" 按鈕的 "水平伸展" 設為 1,"Two" 按鈕的 "水平伸展" 設為 2,"Three" 按鈕的 "水平伸展" 設為 3,該行三個按鈕的伸展因子之和為 1+2+3 == 6,新的空間就按照 1/6 ,2/6 ,3/6 的比例劃分給這三個按鈕 3. 如果把 "One" 按鈕的 "水平伸展" 設為 2,"Two" 按鈕的 "水平伸展" 設為 4,"Three" 按鈕的 "水平伸展" 設為 0,那么在窗口拉大時,分配規律就是:先計算伸展因子之和 2+4+0 == 6,新的空間按照 2/6 ,4/6,0/6 的比例劃分給這三個按鈕 修改布局 通過修改布局的`layoutStretch` ![](https://qtguide.ustclug.org/images/ch06/ch06-05-06.png) ### 代碼修改 1. 直接修改控件的伸展因子(不推薦直接修改控件) ``` //獲取舊的尺寸策略作為底板,修改需要變動的伸展因子 QSizePolicy sp = ui->pushButton1->sizePolicy(); sp.setHorizontalStretch(2); //水平伸展因子 sp.setVerticalStretch(0); //垂直伸展因子 //把新策略設置給按鈕1 ui->pushButton1->setSizePolicy(sp); ``` 2. 修改布局的伸展因子(推薦) ``` void setStretch(int index, int stretch) bool setStretchFactor(QWidget * widget, int stretch) bool setStretchFactor(QLayout * layout, int stretch) ```
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