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desktop: automatically pick a good theme title color

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The preference setting seemed far too strange to do this. And not very user
friendly. So instead we figure out if this is a dark theme or not by looking at
text and background colors in the palette, and make sure we get notified if
that changes.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2020-11-04 13:09:44 -08:00
parent 4c6b00f812
commit 6201ac34b4
6 changed files with 33 additions and 14 deletions
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30
desktop-widgets/tab-widgets/maintab.cpp
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@ -47,6 +47,12 @@ struct Completers {
QCompleter *tags;
};
static bool paletteIsDark(const QPalette &p)
{
// we consider a palette dark if the text color is lighter than the windows background
return p.window().color().valueF() < p.windowText().color().valueF();
}
MainTab::MainTab(QWidget *parent) : QTabWidget(parent),
editMode(false),
ignoreInput(false),
@ -72,6 +78,9 @@ MainTab::MainTab(QWidget *parent) : QTabWidget(parent),
extraWidgets << new TabDiveComputer(this);
ui.tabWidget->addTab(extraWidgets.last(), tr("Device names"));
// make sure we know if this is a light or dark mode
isDark = paletteIsDark(palette());
// call colorsChanged() for the initial setup now that the extraWidgets are loaded
colorsChanged();
@ -704,13 +713,24 @@ void MainTab::clearTabs()
widget->clear();
}
void MainTab::changeEvent(QEvent *ev)
{
if (ev->type() == QEvent::PaletteChange) {
// check if this is a light or dark mode
bool dark = paletteIsDark(palette());
if (dark != isDark) {
// things have changed, so setup the colors correctly
isDark = dark;
colorsChanged();
}
}
QTabWidget::changeEvent(ev);
}
// setup the colors of 'header' elements in the tab widget
void MainTab::colorsChanged()
{
// Put together appropriate CSS stylesheets: NB: colors below in same order as the enum in prefs.h
QStringList colors = { "mediumblue", "lightblue", "black" }; // If using dark theme, set color appropriately
QString colorText = colors[prefs.headerstyle_color];
QString colorText = isDark ? QStringLiteral("lightblue") : QStringLiteral("mediumblue");
QString lastpart = colorText + " ;}";
// only set the color if the widget is enabled
@ -731,5 +751,5 @@ void MainTab::colorsChanged()
// finally call the individual updateUi() functions so they can overwrite these style sheets
for (TabBase *widget: extraWidgets)
widget->updateUi();
widget->updateUi(colorText);
}