Shows how to arrange child widgets along a border.
边框布局 implements a layout that arranges child widgets to surround the main area.
The constructor of the Window class creates a
QTextBrowser
object, to which a BorderLayout named
layout
is added. The declaration of the BorderLayout class is quoted at the end of this document.
Window::Window() { QTextBrowser *centralWidget = new QTextBrowser; centralWidget->setPlainText(tr("Central widget")); BorderLayout *layout = new BorderLayout;
Several labeled widgets are added to
layout
with the orientation
Center
,
North
,
West
,
East 1
,
East 2
,和
South
.
layout->addWidget(centralWidget, BorderLayout::Center); layout->addWidget(createLabel("North"), BorderLayout::North); layout->addWidget(createLabel("West"), BorderLayout::West); layout->addWidget(createLabel("East 1"), BorderLayout::East); layout->addWidget(createLabel("East 2") , BorderLayout::East); layout->addWidget(createLabel("South"), BorderLayout::South); setLayout(layout); setWindowTitle(tr("Border Layout"));
createLabel() in class
Window
sets the text of the labeled widgets and the style.
QLabel *Window::createLabel(const QString &text) { QLabel *label = new QLabel(text); label->setFrameStyle(QFrame::Box | QFrame::Raised); return label; }
Class BorderLayout contains all the utilitarian functions for formatting the widgets it contains.
class BorderLayout : public QLayout { public: enum Position { West, North, South, East, Center }; explicit BorderLayout(QWidget *parent, const QMargins &margins = QMargins(), int spacing = -1); BorderLayout(int spacing = -1); ~BorderLayout(); void addItem(QLayoutItem *item) override; void addWidget(QWidget *widget, Position position); Qt::Orientations expandingDirections() const override; bool hasHeightForWidth() const override; int count() const override; QLayoutItem *itemAt(int index) const override; QSize minimumSize() const override; void setGeometry(const QRect &rect) override; QSize sizeHint() const override; QLayoutItem *takeAt(int index) override; void add(QLayoutItem *item, Position position); private: struct ItemWrapper { ItemWrapper(QLayoutItem *i, Position p) { item = i; position = p; } QLayoutItem *item; Position position; }; enum SizeType { MinimumSize, SizeHint }; QSize calculateSize(SizeType sizeType) const; QList<ItemWrapper *> list; };
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