Qt利用StyleSheet更改大部分默认控件外观_qtdesigner文本背景资源-CSDN文库

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Qt Style Sheets Examples
We will now see a few examples to get started with using Qt Style Sheets.
Style Sheet Usage
Customizing the Foreground and Background Colors
Let's start by setting yellow as the background color of all  QLineEdits in an application. This
could be achieved like this:
 qApp->setStyleSheet("QLineEdit { background-color: yellow }");
If we want the property to apply only to the  QLineEdits that are children (or grandchildren or
grand-grandchildren) of a specific dialog, we would rather do this:
 myDialog->setStyleSheet("QLineEdit { background-color: yellow }");
If we want the property to apply only to one specific  QLineEdit, we can give it a name using
QObject::setObjectName() and use an ID Selector to refer to it:
 myDialog->setStyleSheet("QLineEdit#nameEdit { background-color: yellow }");
Alternatively, we can set the  background-color  property directly on the  QLineEdit, omitting the
selector:
 nameEdit->setStyleSheet("background-color: yellow");
To ensure a good contrast, we should also specify a suitable color for the text:
 nameEdit->setStyleSheet("color: blue; background-color: yellow");
It might be a good idea to change the colors used for selected text as well:
 nameEdit->setStyleSheet("color: blue;"
                         "background-color: yellow;"
                         "selection-color: yellow;"
                         "selection-background-color: blue;");
Customizing Using Dynamic Properties
There are many situations where we need to present a form that has mandatory fields. To indicate
to the user that the field is mandatory, one effective (albeit esthetically dubious) solution is to use
yellow as the background color for those fields. It turns out this is very easy to implement using
Qt Style Sheets. First, we would use the following application-wide style sheet:
 *[mandatoryField="true"] { background-color: yellow }
This means  that every widget whose mandatoryField Qt  property is  set to  true would have  a
yellow background.
Then, for each mandatory field widget, we would simply create a mandatoryField property on the
fly and set it to true. For example:
 QLineEdit *nameEdit = new QLineEdit(this);
 nameEdit->setProperty("mandatoryField", true);
 QLineEdit *emailEdit = new QLineEdit(this);
 emailEdit->setProperty("mandatoryField", true);
 QSpinBox *ageSpinBox = new QSpinBox(this);
 ageSpinBox->setProperty("mandatoryField", true);
Customizing a QPushButton Using the Box Model
This time, we will show how to create a red QPushButton. This QPushButton would presumably
be connected to a very destructive piece of code.