My button's color seems transparent but why?

bladekel

I'm using QTDesigner 5.15.8 and trying to color buttons.
Here is a screenshot of my problem.

I have inserted one button and frame on my mainwindow.
Here is the stylesheet code of mainwindow

QPushButton{
background-color: red;
}
QFrame{
background-color: red;
}

They are same but as you see they look different. I couldnt find why it happened but it happens even if I created a new project...

Pl45m4

@bladekel

Because it is how your OS draws a button.
Don't use a stylesheet on a QPushButton if you want your "button" to be just a plain red rectangle or square.
Make your own subclass of QPushButton and use a painter to draw the rectangle yourself.

bladekel

@Pl45m4
On my previous project I can do what I want. I can add a new pushbutton and can color with stylesheet to whatever color I want...
But on newer project I cant do ....

Christian Ehrlicher

It's the gradient from the fusion style what you're seeing here I would guess.

Pl45m4

@bladekel

Does your old project use the same Windows style?
"Fusion" as mentioned by @Christian-Ehrlicher

Either change that or make your own button class and draw the plain rect you want.

bladekel

I found the solution. The reason is border....
Thanks for all...

~~Warning: If you only set a background-color on a QPushButton, the background may not appear unless you set the border property to some value. This is because, by default, the QPushButton draws a native border which completely overlaps the background-color. For example,
QPushButton { background-color: red; border: none; }
See Customizing QPushButton for an example. ~~