设置QPushButton的背景图片

最新推荐文章于 2023-09-18 09:30:06 发布

fanzhang1990

最新推荐文章于 2023-09-18 09:30:06 发布

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本文深入探讨了QPalette在Qt中的应用，详细解释了如何使用QPalette设置组件的样式，包括背景、文本等元素，并通过实例展示了设置图片作为按钮背景的方法，以及设置图片作为组件背景的技巧。

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setIcon(QIcon("toolbutton.png"));
setIconSize(QSize(48, 48));

如果没有下面那句话，该图片是被缩放的放到图片上

如果加上下面那句话这该图片的背景图被设置为当前尺寸

如果不是按钮可以用调色板来实现

      QPalette p = palette();
      p.setBrush(QPalette::Button, QBrush(QPixmap("toolbutton.png")));
      setPalette(p);

注意：setBrush的第一个参数文档上是这样说的：

void QPalette::setBrush ( ColorRole role, const QBrush & brush );

enum QPalette::ColorRole

The ColorRole enum defines the different symbolic color roles used in current GUIs.

The central roles are:

Constant	Value	Description
`QPalette::Window`	`10`	A general background color.
`QPalette::Background`	`Window`	This value is obsolete. Use Window instead.
`QPalette::WindowText`	`0`	A general foreground color.
`QPalette::Foreground`	`WindowText`	This value is obsolete. Use WindowText instead.
`QPalette::Base`	`9`	Used mostly as the background color for text entry widgets, but can also be used for other painting - such as the background of combobox drop down lists and toolbar handles. It is usually white or another light color.
`QPalette::AlternateBase`	`16`	Used as the alternate background color in views with alternating row colors (see QAbstractItemView::setAlternatingRowColors()).
`QPalette::ToolTipBase`	`18`	Used as the background color for QToolTip and QWhatsThis.
`QPalette::ToolTipText`	`19`	Used as the foreground color for QToolTip and QWhatsThis.
`QPalette::Text`	`6`	The foreground color used with `Base`. This is usually the same as the `WindowText`, in which case it must provide good contrast with `Window` and `Base`.
`QPalette::Button`	`1`	The general button background color. This background can be different from `Window` as some styles require a different background color for buttons.
`QPalette::ButtonText`	`8`	A foreground color used with the `Button` color.
`QPalette::BrightText`	`7`	A text color that is very different from `WindowText`, and contrasts well with e.g. `Dark`. Typically used for text that needs to be drawn where `Text` or `WindowText` would give poor contrast, such as on pressed push buttons. Note that text colors can be used for things other than just words; text colors are usually used for text, but it's quite common to use the text color roles for lines, icons, etc.

There are some color roles used mostly for 3D bevel and shadow effects. All of these are normally derived from Window, and used in ways that depend on that relationship. For example, buttons depend on it to make the bevels look attractive, and Motif scroll bars depend on Mid to be slightly different from Window.

Constant	Value	Description
`QPalette::Light`	`2`	Lighter than `Button` color.
`QPalette::Midlight`	`3`	Between `Button` and `Light`.
`QPalette::Dark`	`4`	Darker than `Button`.
`QPalette::Mid`	`5`	Between `Button` and `Dark`.
`QPalette::Shadow`	`11`	A very dark color. By default, the shadow color is Qt::black.

Selected (marked) items have two roles:

Constant	Value	Description
`QPalette::Highlight`	`12`	A color to indicate a selected item or the current item. By default, the highlight color is Qt::darkBlue.
`QPalette::HighlightedText`	`13`	A text color that contrasts with `Highlight`. By default, the highlighted text color is Qt::white.

There are two color roles related to hyperlinks:

Constant	Value	Description
`QPalette::Link`	`14`	A text color used for unvisited hyperlinks. By default, the link color is Qt::blue.
`QPalette::LinkVisited`	`15`	A text color used for already visited hyperlinks. By default, the linkvisited color is Qt::magenta.

Note that we do not use the Link and LinkVisited roles when rendering rich text in Qt, and that we recommend that you use CSS and the QTextDocument::setDefaultStyleSheet() function to alter the appearance of links. For example:

     QTextBrowser browser;
     QColor linkColor(Qt::red);
     QString sheet = QString::fromLatin1("a { text-decoration: underline; color: %1 }").arg(linkColor.name());
     browser.document()->setDefaultStyleSheet(sheet);