QT qsplitter splitter

1. brief introduction

QSplitter The splitter allows users to control the size of subassemblies by dragging the boundaries between them .

A single splitter can control any number of widgets .QSplitter The typical use of is to create several widgets , And use insertWidget() or addWidget() Add them .

2. Common methods

void addWidget(QWidget *widget)	add to widget
int count() const	Returns the number of widgets contained in the splitter layout .
void setOrientation(Qt::Orientation)	Set the direction , level , vertical , Default horizontal
void setStretchFactor(int index, int stretch)	Set the expansion coefficient
void insertWidget(int index, QWidget *widget)	Insert widget

By default ,QSplitter Will dynamically adjust the size of its child elements . If you wish QSplitter Adjust the size of child elements only at the end of the resizing operation , So called setOpaqueResize(false).

void setOpaqueResize(bool opaque = true)

Set the respective sizes of the subassemblies to the values given in the list .

If splitter It's horizontal , Then these values will set the width of each widget in pixels , From left to right .

If splitter It's vertical , Then set the height of each widget from top to bottom

void setSizes(const QList<int> &list)

3. Example

3.1 Expansion coefficient

add to 3 individual QPlainTextEdit, Added in the default horizontal way , And set the expansion coefficient , I personally understand , Expansion coefficient , like , ratio . The scale of the above figure is 2:1:1.

Source code ：

    QSplitter *s1 = new QSplitter(this);
    ui->verticalLayout->addWidget(s1);

    // add to 3 individual widget
    QPlainTextEdit *t1 = new QPlainTextEdit(s1);
    t1->setPlaceholderText("t1");

    QPlainTextEdit *t2 = new QPlainTextEdit(s1);
    t2->setPlaceholderText("t2");

    QPlainTextEdit *t3 = new QPlainTextEdit(s1);
    t3->setPlaceholderText("t3");

    s1->addWidget(t1);
    s1->addWidget(t2);
    s1->addWidget(t3);

    s1->setStretchFactor(0,2);
    s1->setStretchFactor(1,1);
    s1->setStretchFactor(2,1);

3.2 setOpaqueResize(false) effect

The default is true, The effect is as follows

3.3QSplitter Nesting with each other

Source code ：

    QSplitter *mainSplitter = new QSplitter(this);
    ui->verticalLayout->addWidget(mainSplitter);

    QSplitter *rightSplitter = new QSplitter(mainSplitter);
    rightSplitter->setOrientation(Qt::Vertical);    // Set the vertical direction 

    // add to 3 individual widget
    QPlainTextEdit *t1 = new QPlainTextEdit(mainSplitter);
    t1->setPlaceholderText("t1");

    QPlainTextEdit *t2 = new QPlainTextEdit(rightSplitter);
    t2->setPlaceholderText("t2");

    QPlainTextEdit *t3 = new QPlainTextEdit(rightSplitter);
    t3->setPlaceholderText("t3");

    rightSplitter->addWidget(t2);
    rightSplitter->addWidget(t3);

    mainSplitter->addWidget(t1);
    mainSplitter->addWidget(rightSplitter);