QPalette::brush

[tpf80]

Currently, I am using a QTableWidget that has alternating colors, however I wanted to alternate the color every other row instead of every row. I made a function for this and it works properly. The problem is, that I still want to use QPalette::AlternateBase and QPalette::Base for the colors.

Currently I can color the brush as follows:

QBrush tableNoHighlight;
tableNoHighlight.setStyle (Qt::SolidPattern);
tableNoHighlight.setColor(Qt::white);
 
QBrush tableYesHighlight;
tableYesHighlight.setStyle (Qt::SolidPattern);
tableYesHighlight.setColor(Qt::lightGray);

QBrush tableNoHighlight;
tableNoHighlight.setStyle (Qt::SolidPattern);
tableNoHighlight.setColor(Qt::white);

QBrush tableYesHighlight;
tableYesHighlight.setStyle (Qt::SolidPattern);
tableYesHighlight.setColor(Qt::lightGray);

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However, since the colors are hard set, the highlighting does not match the particular look and feel of the OS that the program might be run in. Thus I wanted to use QPalette::AlternateBase and QPalette::Base.

I tried the following:

tableNoHighlight = QPalette::brush(QPalette::AlternateBase);
tableNoHighlight = QPalette::brush(QPalette::Base);

tableNoHighlight = QPalette::brush(QPalette::AlternateBase);
tableNoHighlight = QPalette::brush(QPalette::Base);

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and I got this error:

alculatorform.cpp:81: error: cannot call member function `const QBrush& QPalette::brush(QPalette::ColorRole) const' without object
alculatorform.cpp:87: error: cannot call member function `const QBrush& QPalette::brush(QPalette::ColorRole) const' without object

so I tried:

tableNoHighlight = this->brush(QPalette::AlternateBase);
tableNoHighlight = this->brush(QPalette::Base);

tableNoHighlight = this->brush(QPalette::AlternateBase);
tableNoHighlight = this->brush(QPalette::Base);

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and

tableNoHighlight = ui->brush(QPalette::AlternateBase);
tableNoHighlight = ui->brush(QPalette::Base);

tableNoHighlight = ui->brush(QPalette::AlternateBase);
tableNoHighlight = ui->brush(QPalette::Base);

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and both yielded errors about having no member named brush.

How can I get the brush of QPalette::AlternateBase and QPalette::Base (or at least the color value) to use elsewhere?

[rajesh]

use the following:

setBackgroundRole( QPalette::AlternateBase);
setBackgroundRole( QPalette::Base);
 
OR
 
 QPalette palette; 
 palette.setColor(m_tabel->backgroundRole(), Qt::transparent); // any Qt::color
 m_tabel->setPalette(palette);

setBackgroundRole( QPalette::AlternateBase);
setBackgroundRole( QPalette::Base);
 
OR
 
 QPalette palette; 
 palette.setColor(m_tabel->backgroundRole(), Qt::transparent); // any Qt::color
 m_tabel->setPalette(palette);

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[tpf80]

perhaps i didn't explain well enough what I am doing. I am coloring the rows in a QTableWidget in alternating colors, but 2 rows 1 color, then 2 rows the other. The only way I have found so far was to color the cells as I generate the rows:

ui.tablewidget->item(0, 3)->setBackground(highlightBrush);
ui.tablewidget->item(0, 4)->setBackground(highlightBrush);
//etc...

ui.tablewidget->item(0, 3)->setBackground(highlightBrush);
ui.tablewidget->item(0, 4)->setBackground(highlightBrush);
//etc...

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This works, however it does not completely match the base and alternate base color (because I don't know how to construct brushes that take from those colors)

The background role method:

//this produces errors as a qtablewidgetitem does not have setBackgroundRole()
ui.tableWidget->item(0, 1)->setBackgroundRole(QPalette::AlternateBase);
ui.tableWidget->item(0, 2)->setBackgroundRole(QPalette::Base);

//this produces errors as a qtablewidgetitem does not have setBackgroundRole()
ui.tableWidget->item(0, 1)->setBackgroundRole(QPalette::AlternateBase);
ui.tableWidget->item(0, 2)->setBackgroundRole(QPalette::Base);

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Will not work because QTableWidgetItem does not accept setBackgroundRole, it only accepts a brush in setBackground()

so all I need to know really, is how to create a brush from the color used in QPalette::AlternateBase and QPalette::Base or use the existing brush for those colors (but how to reference it I have no clue.

[jacek]

so all I need to know really, is how to create a brush from the color used in QPalette::AlternateBase and QPalette::Base

Ask QPalette to give you one.

[tpf80]

I actually tried this (see above) but I got errors. (this was the way I really wanted to do it)

tableNoHighlight = QPalette::brush(QPalette::AlternateBase);
 tableNoHighlight = QPalette::brush(QPalette::Base);

tableNoHighlight = QPalette::brush(QPalette::AlternateBase);
 tableNoHighlight = QPalette::brush(QPalette::Base);

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it asks for an object, but I am not quite sure what object its asking for.

[jacek]

it asks for an object, but I am not quite sure what object its asking for.

QPalette::brush() isn't a static method, so you have to create a QPalette object first:

QPalette p;
tableNoHighlight = p.brush(QPalette::Base);

QPalette p;
tableNoHighlight = p.brush(QPalette::Base);

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[tpf80]

ah I see.. I knew it was something simple that I was missing...