QT常规控件操作备忘

QLabel设置边框和颜色：

label->setFrameShape (QFrame::Box);

label->setStyleSheet("border: 1px solid  #ff0000");

设置字体大小和颜色：

ui.label是QLabel

ui.label_4->setText("some text");

//设置字号

QFont ft;

ft.setPointSize();

ui.label_4->setFont(ft);

//设置颜色

QPalette pa;

pa.setColor(QPalette::WindowText,Qt::red);

ui.label_4->setPalette(pa);

QTreeWidget中加入按钮：

void setItemWidget ( QTreeWidgetItem * item, int column, QWidget * widget )；

怎么设置QTreeWidget的列宽？setSizeHint似乎不起作用

QTreeWidgetItem *headItem = watchTree->headerItem();

    headItem->setSizeHint(,QSize(,));

    headItem->setSizeHint(,QSize(,));

    headItem->setText(,tr("GisRes"));

    headItem->setText(,tr("period"));

是setLineWidth

为了方便，利用QLabel来形成QSplitter之间的间隙，但是无法精确控制宽度

setSizePolicy(QSizePolicy::Policy horizontal, QSizePolicy::Policy vertical)

遍历树QTreeWidget：

int treeCount(QTreeWidget *tree, QTreeWidgetItem *parent = )

{

    int count = ;

    if (parent == ) {

        int topCount = tree->topLevelItemCount();

        for (int i = ; i < topCount; i++) {

            QTreeWidgetItem *item = tree->topLevelItem(i);

            if (item->isExpanded()) {

                count += treeCount(tree, item);

            }

        }

        count += topCount;

    } else {

        int childCount = parent->childCount();

        for (int i = ; i < childCount; i++) {

            QTreeWidgetItem *item = parent->child(i);

            if (item->isExpanded()) {

                count += treeCount(tree, item);

            }

        }

        count += childCount;

    }

    return count;

}

And the usage:

QTreeWidget tw;

// Add items

[..]

int visibleItemsCount = treeCount(&tw);