Qt编写自定义控件47-面板区域控件

#ifndef PANELWIDGET_H
#define PANELWIDGET_H

/**
 * 面板容器控件 作者:feiyangqingyun(QQ:517216493) 2016-11-20
 * 1:支持所有widget子类对象,自动产生滚动条
 * 2:支持自动拉伸自动填充
 * 3:提供接口获取容器内的所有对象的指针
 * 4:可设置是否自动拉伸宽度高度
 * 5:可设置设备面板之间的间距和边距
 */

#include <QWidget>

class QScrollArea;
class QFrame;
class QVBoxLayout;
class QGridLayout;

#ifdef quc
#if (QT_VERSION < QT_VERSION_CHECK(5,7,0))
#include <QtDesigner/QDesignerExportWidget>
#else
#include <QtUiPlugin/QDesignerExportWidget>
#endif

class QDESIGNER_WIDGET_EXPORT PanelWidget : public QWidget
#else
class PanelWidget : public QWidget
#endif

{
    Q_OBJECT
    Q_PROPERTY(int margin READ getMargin WRITE setMargin)
    Q_PROPERTY(int space READ getSpace WRITE setSpace)
    Q_PROPERTY(bool autoWidth READ getAutoWidth WRITE setAutoWidth)
    Q_PROPERTY(bool autoHeight READ getAutoHeight WRITE setAutoHeight)

public:
    explicit PanelWidget(QWidget *parent = 0);

protected:
    void resizeEvent(QResizeEvent *);

private:
    QScrollArea *scrollArea;            //滚动区域
    QWidget *scrollAreaWidgetContents;  //滚动区域载体
    QFrame *frame;                      //放置设备的框架,自动变宽变高
    QVBoxLayout *verticalLayout;        //设备面板总布局
    QGridLayout *gridLayout;            //设备表格布局

    int margin;                         //边距
    int space;                          //设备之间的间隔
    bool autoWidth;                     //宽度自动拉伸
    bool autoHeight;                    //高度自动拉伸

    QList<QWidget *> widgets;           //设备面板对象集合
    int columnCount;                    //面板列数

public:
    QSize sizeHint()                const;
    QSize minimumSizeHint()         const;

    int getMargin()                 const;
    int getSpace()                  const;
    bool getAutoWidth()             const;
    bool getAutoHeight()            const;

    QList<QWidget *> getWidgets();
    int getColumnCount();

public Q_SLOTS:
    void setWidget(QList<QWidget *> widgets, int columnCount);
    void setMargin(int left, int top, int right, int bottom);
    void setMargin(int margin);
    void setSpace(int space);
    void setAutoWidth(bool autoWidth);
    void setAutoHeight(bool autoHeight);

};

#endif // PANELWIDGET_H

void PanelWidget::setWidget(QList<QWidget *> widgets, int columnCount)
{
    this->widgets = widgets;
    this->columnCount = columnCount;

    int row = 0;
    int column = 0;
    int index = 0;

    //先把之前的所有移除并不可见
    foreach (QWidget *widget, widgets) {
        gridLayout->removeWidget(widget);
        widget->setVisible(false);
    }

    //重新添加到布局中并可见
    foreach (QWidget *widget, widgets) {
        gridLayout->addWidget(widget, row, column);
        widget->setVisible(true);

        column++;
        index++;
        if (index % columnCount == 0) {
            row++;
            column = 0;
        }
    }

    row++;

    //设置右边弹簧
    if (!autoWidth) {
        QSpacerItem *hSpacer = new QSpacerItem(1, 1, QSizePolicy::Expanding, QSizePolicy::Minimum);
        gridLayout->addItem(hSpacer, 0, gridLayout->columnCount());
    }

    //设置底边弹簧
    if (!autoHeight) {
        QSpacerItem *vSpacer = new QSpacerItem(1, 1, QSizePolicy::Minimum, QSizePolicy::Expanding);
        gridLayout->addItem(vSpacer, row, 0);
    }
}

void PanelWidget::setMargin(int left, int top, int right, int bottom)
{
    gridLayout->setContentsMargins(left, top, right, bottom);
}

void PanelWidget::setMargin(int margin)
{
    if (this->margin != margin) {
        setMargin(margin, margin, margin, margin);
    }
}

void PanelWidget::setSpace(int space)
{
    if (this->space != space) {
        gridLayout->setSpacing(space);
    }
}

void PanelWidget::setAutoWidth(bool autoWidth)
{
    if (this->autoWidth != autoWidth) {
        this->autoWidth = autoWidth;
    }
}

void PanelWidget::setAutoHeight(bool autoHeight)
{
    if (this->autoHeight != autoHeight) {
        this->autoHeight = autoHeight;
    }
}