void QLayout::setContentsMargins ( int left, int top, int right, int bottom )

Sets the left, top, right, and bottom margins to use around the layout.

By default, QLayout uses the values provided by the style. On most platforms, the margin is 11 pixels in all directions.

This function was introduced in Qt 4.3.

這個說預設有11畫素的間隙。

測試不行。

//hlayout->setContentsMargins(0,0,0,0);

//hlayout->setContentsMargins(QMargins(0,0,0,0));

主要通過setMargin(0) 設定Layout 的外部邊界為0

hlayout->addWidget(start);

hlayout->addWidget(settle);

hlayout->addWidget(treatement);

hlayout->addWidget(final);

//hlayout->setStretchFactor(hlayout,0);
 

hlayout->setMargin(0);

//hlayout->setContentsMargins(0,0,0,0);

//hlayout->setContentsMargins(QMargins(0,0,0,0));

hlayout->setSpacing(0);

    //這個設定成功