Transparency settings for QT form controls (three methods)

1. Entire form

When you set up the Qt form (Qmainwindow, Qdialog), use the

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1. Targetform->setwindowopacity ()

function to make it transparent to all controls in the form and in the window.

Ii. Customizing a page or control

When setting a Qwidget (General custom page or control with Qwidget), setting its form transparency directly does not achieve transparency, the method currently found is to use the entire qwidget as a graphical element to set the transparency effect on the graphic element.

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1. Qgraphicsopacityeffect *opacityeffect=New Qgraphicsopacityeffect;
2. Targetelement->setgraphicseffect (Opacityeffect);
3. Opacityeffect->setopacity (0.7);

This can be done with transparency.

Third, set the transparency value in the color

If you need to paint your own shape, control background, borders, text, etc. can be color-colored places to be transparent, only need to set the color of the site a transparency.

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1. Draw a translucent rounded rectangle
2. Qpainter *painter = new Qpainter (this);
3. Painter->setpen (Qt::nopen);
4. Painter->setbrush (Qcolor (0,170,255,100)); //Last item for transparency
5. Painter->setopacity (0.6);
6. Painter->drawroundrect (0,0,100,100,10,10); //Draw rounded rectangles

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1. Sets the background color of a control to translucent
2. Qwidget *widget = new Qwidget; Qwidget can be any qwidget-derived control
3. Widget->setautofillbackground (true);
5. Qpalette Palette;
6. Palette.setcolor (Qpalette::background, Qcolor (192,253,123,100)); //Last item for transparency
7. Palette.setbrush (Qpalette::background, Qbrush (Qpixmap (":/background.png"));
8. Widget>setpalette (palette);
10. If the background image needs to be transparent, make a background with a translucent PNG image or use the method two to semitransparent the entire control.

This usage is typically used for a few more places where transparency is required, and if the self-painted content is more complex, it is easier to set the overall transparency effect directly.

http://blog.csdn.net/jelly_chen_zo/article/details/45538755

Transparency settings for QT form controls (three methods)