Shulou(Shulou.com)06/03 Report--

Recently, in beautifying QT, I have been in a hurry to write pure code and beautify the interface. A lot of information has been searched on the Internet, but as the huge project has not yet been completed, first sort out the information on the Internet, there are some unused, save for later. Wait for my interface to be beautified and then po up.

/ * * reprint split line * /

Some experiences of Qt

This article is from: http://blog.csdn.net/lpt19832003/archive/2010/03/15/5381095.aspx

one。 The background is painted black and the foreground color is set to white.

Method 1, paltette mode, after testing, this method will not affect other controls, it is recommended to use

Click (here) to collapse or open

QPalette bgpal = palette ()

Bgpal.setColor (QPalette::Background, QColor (0,0,0,255))

/ / bgpal.setColor (QPalette::Background, Qt::transparent)

Bgpal.setColor (QPalette::Foreground, QColor (255255255255); setPalette (bgpal)

Method 2. Stylesheet method

The way to affect child controls is:

Click (here) to collapse or open

SetStyleSheet ("background-color: rgb; color: rgb (255255255);")

The method that does not affect child controls is:

Click (here) to collapse or open

SetStyleSheet ("venus--TitleBar {background-color: rgb; color: rgb (255255255);}")

Or

Click (here) to collapse or open

This- > setObjectName ("pw"); / / set the object sentence, which is equivalent to id in css

This- > setStyleSheet ("# pw {border-p_w_picpath: url (: / new/prefix1/Pic/54.png);}"); / / sets the background color of the id corresponding element

two。 The fillet control uses stylesheet mode

Click (here) to collapse or open

SetStyleSheet ("border:2px groove gray;border-radius:10px;padding:2px 4px;")

three。 Fillet window

Click (here) to collapse or open

RoundRectWin::RoundRectWin ()

{

QPalette p = palette ()

QPixmap img ("roundrect.png")

QBitmap mask ("roundrect_mask.png")

P.setBrush (QPalette::Window, QBrush (img))

SetPalette (p)

SetMask (mask)

Resize (img.size ())

/ / setWindowFlags (Qt::FramelessWindowHint); / / this sentence removes the title bar} Note: the extra part of the picture of mask is set to white.

}

four。 Translucent window

1. The window is overall transparent, but the controls on the form are opaque. By setting the background color of the form, the background color is set to fully transparent.

Click (here) to collapse or open

QPalette pal = palette ()

Pal.setColor (QPalette::Background, QColor (0x00.0xff.0x00.0x00))

SetPalette (pal)

Note: the title bar of the form is opaque, the controls on the client area of the form are opaque, the QLabel control is only a word display, and the background color of the control is transparent; the client area of the form is completely transparent.

In addition, the methods seen on the Internet:

Click (here) to collapse or open

SetAttribute (Qt::WA_TranslucentBackground, true)

The result of the experiment is similar to the method above, but sometimes the form is filled with mottled spots and the reason is not found.

two。 The window and its controls are translucent:

Click (here) to collapse or open

SetWindowOpacity (0.7)

Experimental effect: windows and controls are translucent. Be careful not to setWindowFlags (Qt::FramelessWindowHint); otherwise it won't work.

3. The window is opaque as a whole and partially transparent:

Use Clear mode to draw in the Paint event.

Click (here) to collapse or open

Void TestWindow::paintEvent (QPaintEvent*)

{

QPainter p (this)

P.setCompositionMode (QPainter::CompositionMode_Clear)

P.fillRect (10,10,300,300, Qt::SolidPattern)

}

Experimental effect: the drawing area is completely transparent. If the drawing area has a control, it does not affect the control.

The above experiments are all based on the Qte test of Directfb. The effect will be slightly different under Linux and Windows.

For example, in the third experiment under Windows, the drawing area is a black hole. If the Window itself is semi-transparent, it is the content under the Window plus the semi-transparent effect, not the full transparent effect.

five。 Control the alpha of QPixmap

Click (here) to collapse or open

QPixmap temp (pixmapTop.size ()); temp.fill (Qt::transparent)

QPainter p (& temp)

P.setCompositionMode (QPainter::CompositionMode_Source)

P.drawPixmap (0,0, pixmapTop)

P.setCompositionMode (QPainter::CompositionMode_DestinationIn)

P.fillRect (temp.rect (), QColor (0,0,0, alpha)); / /-- lable displays foreground images ui- > label- > setScaledContents (true)

Ui- > label- > setPixmap (temp)

six。 Boundary of layout

Click (here) to collapse or open

Layout- > setMargin (0)

Finally got the translucency of qt.

This article is from: http://hi.baidu.com/sszllx/blog/item/ab833a59ea98622f2934f001.html

Click (here) to collapse or open

QFrame * frame = new QFrame ()

QPixmap grabPixmap = QPixmap::grabWindow (frame- > winId (), 20,0,100,100)

Frame- > setGeometry (20,20,100,100)

Frame- > hide ()

QPixmap pixmap = Resource::loadPixmap ("qpelogo")

QImage p_w_picpath = pixmap.convertToImage ()

/ / p_w_picpath.convertDepth (32)

P_w_picpath.setAlphaBuffer (true)

QImage bgImage = grabPixmap.convertToImage ()

/ / bgImage.convertDepth (32)

BgImage.setAlphaBuffer (true)

Double k = 0.5

QRgb * rgbpos1 = p_w_picpath.colorTable ()

QRgb * rgbpos2 = bgImage.colorTable ()

For (int y = 0; y rect ()

QPainterPath path

/ / counterclockwise

Path.moveTo (arcR, 0)

Path.arcTo (0,0, arcR * 2, arcR * 2,90.0f, 90.0f)

Path.lineTo (0, rect.height ())

Path.lineTo (rect.width (), rect.height ())

Path.lineTo (rect.width (), arcR)

Path.arcTo (rect.width ()-arcR * 2,0, arcR * 2, arcR * 2,0.0f, 90.0f)

Path.lineTo (arcR, 0)

P.drawPath (path)

P.fillPath (path, QBrush (Qt::Red)); / / arm and windows platforms without this line of code will display a transparent, empty box

SetMask (bmp)

two。

In the constructor

Click (here) to collapse or open

SetAttribute (Qt::WA_TranslucentBackground, true)

SetWindowFlags (Qt::Window | Qt::FramelessWindowHint | Qt::WindowSystemMenuHint

| | Qt::WindowMinimizeButtonHint | Qt::WindowMaximizeButtonHint) |

Overload paintEvent

Click (here) to collapse or open

QPainter p (this)

P.drawRoundedRect (0,0, width ()-1, height ()-1,20,20)

3. Background picture

Click (here) to collapse or open

QPixmap pixmap (": / p_w_picpaths/*.png")

SetMask (pixmap.mask ())

QPalette palette

Palette.setBrush (QPalette::Background, QBrush (pixmap))

SetPalette (palette)

Resize (pixmap.size ())

SetMask (pixmap.mask ())

The same setMask (); is strangely different on three different platforms.

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