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Thread: Dynamically change spacing between icon and label in QPushButton

  1. #1
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    Default Dynamically change spacing between icon and label in QPushButton

    I am frustratingly trying to dynamically change the spacing between the icon and the label inside a QPushButton, for different screen sizes. Looking through the source code in qcommonstyle.cpp, this spacing is hardcoded as 4.
    Qt Code:
    1. if (!button->icon.isNull()) {
    2. ...
    3. QPixmap pixmap = button->icon.pixmap(button->iconSize, mode, state);
    4. int labelWidth = pixmap.width();
    5. int labelHeight = pixmap.height();
    6. int iconSpacing = 4; //### 4 is currently hardcoded in QPushButton::sizeHint()
    7. int textWidth = button->fontMetrics.boundingRect(opt->rect, tf, button->text).width();
    8. if (!button->text.isEmpty())
    9. labelWidth += (textWidth + iconSpacing);
    10. ...
    11. }
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    Changing it to what I want seems trivial, if I could recompile QT. But there should be a solution using default/precompiled libraries. I tried to create a QProxyStyle, which would basically reimplement the CE_PushButtonLabel case of its drawControl method. But then it wasn't properly drawn, changing the previously css-setted border and the background-color of the pressed state. I applied the following QProxyStyle using both QApplication::setStyle() and directly instantiating the style in the paintEvent of my button, neither changed only the spacing.
    Qt Code:
    1. class ProperlyAlignedPushButtonStyle : public QProxyStyle
    2. {
    3. public:
    4. ProperlyAlignedPushButtonStyle() : QProxyStyle(QStyleFactory::create("windows")) {}
    5.  
    6. void drawControl(ControlElement element, const QStyleOption *opt, QPainter *p, const QWidget *widget) const
    7. {
    8. if (element == CE_PushButtonLabel) {
    9. ...
    10. int iconSpacing = (textRect.width() - (labelWidth + textWidth) ) / 3;
    11. ...
    12. else {
    13. QProxyStyle::drawControl(element, opt, p, widget);
    14. }
    15. }
    16. };
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    Qt Code:
    1. void OrientationButton::paintEvent(QPaintEvent* event) {
    2. ProperlyAlignedPushButtonStyle pa;
    3. pa.drawControl(QStyle::CE_PushButton, &getStyleOption(), &p, this);
    4. }
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    Any ideas? Thanks in advance!

  2. #2
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    Default Re: Dynamically change spacing between icon and label in QPushButton

    In general trying to mix stylesheets with real styles is a bad idea. Decide to use one and stick with this decision.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  3. The following user says thank you to wysota for this useful post:

    bernardoreis (5th September 2013)

  4. #3
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    Default Re: Dynamically change spacing between icon and label in QPushButton

    You're probably right. It doesn't look like that I can easily retrieve stylesheets' infomation and use it to paint a widget myself.

    Thanks for the advice.

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