Differential D25543 Diff 70382 kstyle/widgets/scrollbar.cpp

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kstyle/widgets/scrollbar.cpp

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1​#include "breezestyle.h"
2​
3​#include <QScrollBar>
4​
5​namespace Breeze
6​{
7​QColor Helper::scrollBarHandleColor(const QPalette &palette, bool mouseOver, bool hasFocus, qreal opacity, AnimationMode mode) const
8​{
9​ QColor color(alphaColor(palette.color(QPalette::WindowText), 0.5));
10​
11​ // hover takes precedence over focus
12​ if (mode == AnimationHover) {
13​ const QColor hover(hoverColor(palette));
14​ const QColor focus(focusColor(palette));
15​ if (hasFocus)
16​ color = KColorUtils::mix(focus, hover, opacity);
17​ else
18​ color = KColorUtils::mix(color, hover, opacity);
19​
20​ } else if (mouseOver) {
21​ color = hoverColor(palette);
22​
23​ } else if (mode == AnimationFocus) {
24​ const QColor focus(focusColor(palette));
25​ color = KColorUtils::mix(color, focus, opacity);
26​
27​ } else if (hasFocus) {
28​ color = focusColor(palette);
29​ }
30​
31​ return color;
32​}
33​
34​//______________________________________________________________________________
35​void Helper::renderScrollBarHandle(QPainter *painter, const QRect &rect, const QColor &color) const
36​{
37​ // setup painter
38​ painter->setRenderHint(QPainter::Antialiasing, true);
39​
40​ const QRectF baseRect(rect);
41​ const qreal radius(0.5 * std::min({baseRect.width(), baseRect.height(), (qreal)Metrics::ScrollBar_SliderWidth}));
42​
43​ // content
44​ if (color.isValid()) {
45​ painter->setPen(Qt::NoPen);
46​ painter->setBrush(color);
47​ painter->drawRoundedRect(baseRect, radius, radius);
48​ }
49​}
50​
51​//___________________________________________________________________________________________________________________
52​QRect Style::scrollBarInternalSubControlRect(const QStyleOptionComplex *option, SubControl subControl) const
53​{
54​ const auto &rect = option->rect;
55​ const State &state(option->state);
56​ const bool horizontal(state & State_Horizontal);
57​
58​ switch (subControl) {
59​ case SC_ScrollBarSubLine: {
60​ int majorSize(scrollBarButtonHeight(_subLineButtons));
61​ if (horizontal)
62​ return visualRect(option, QRect(rect.left(), rect.top(), majorSize, rect.height()));
63​ else
64​ return visualRect(option, QRect(rect.left(), rect.top(), rect.width(), majorSize));
65​ }
66​
67​ case SC_ScrollBarAddLine: {
68​ int majorSize(scrollBarButtonHeight(_addLineButtons));
69​ if (horizontal)
70​ return visualRect(option, QRect(rect.right() - majorSize + 1, rect.top(), majorSize, rect.height()));
71​ else
72​ return visualRect(option, QRect(rect.left(), rect.bottom() - majorSize + 1, rect.width(), majorSize));
73​ }
74​
75​ default:
76​ return QRect();
77​ }
78​}
79​
80​//___________________________________________________________________________________________________________________
81​QRect Style::scrollBarSubControlRect(const QStyleOptionComplex *option, SubControl subControl, const QWidget *widget) const
82​{
83​ // cast option and check
84​ const auto sliderOption(qstyleoption_cast<const QStyleOptionSlider *>(option));
85​ if (!sliderOption)
86​ return ParentStyleClass::subControlRect(CC_ScrollBar, option, subControl, widget);
87​
88​ // get relevant state
89​ const State &state(option->state);
90​ const bool horizontal(state & State_Horizontal);
91​
92​ switch (subControl) {
93​ case SC_ScrollBarSubLine:
94​ case SC_ScrollBarAddLine:
95​ return scrollBarInternalSubControlRect(option, subControl);
96​
97​ case SC_ScrollBarGroove: {
98​ auto topRect = visualRect(option, scrollBarInternalSubControlRect(option, SC_ScrollBarSubLine));
99​ auto bottomRect = visualRect(option, scrollBarInternalSubControlRect(option, SC_ScrollBarAddLine));
100​
101​ QPoint topLeftCorner;
102​ QPoint botRightCorner;
103​
104​ if (horizontal) {
105​ topLeftCorner = QPoint(topRect.right() + 1, topRect.top());
106​ botRightCorner = QPoint(bottomRect.left() - 1, topRect.bottom());
107​
108​ } else {
109​ topLeftCorner = QPoint(topRect.left(), topRect.bottom() + 1);
110​ botRightCorner = QPoint(topRect.right(), bottomRect.top() - 1);
111​ }
112​
113​ // define rect
114​ return visualRect(option, QRect(topLeftCorner, botRightCorner));
115​ }
116​
117​ case SC_ScrollBarSlider: {
118​ // handle RTL here to unreflect things if need be
119​ auto groove = visualRect(option, subControlRect(CC_ScrollBar, option, SC_ScrollBarGroove, widget));
120​
121​ if (sliderOption->minimum == sliderOption->maximum)
122​ return groove;
123​
124​ // Figure out how much room there is
125​ int space(horizontal ? groove.width() : groove.height());
126​
127​ // Calculate the portion of this space that the slider should occupy
128​ int sliderSize = space * qreal(sliderOption->pageStep) / (sliderOption->maximum - sliderOption->minimum + sliderOption->pageStep);
129​ sliderSize = qMax(sliderSize, static_cast<int>(Metrics::ScrollBar_MinSliderHeight));
130​ sliderSize = qMin(sliderSize, space);
131​
132​ space -= sliderSize;
133​ if (space <= 0)
134​ return groove;
135​
136​ int pos = qRound(qreal(sliderOption->sliderPosition - sliderOption->minimum) / (sliderOption->maximum - sliderOption->minimum) * space);
137​ if (sliderOption->upsideDown)
138​ pos = space - pos;
139​ if (horizontal)
140​ return visualRect(option, QRect(groove.left() + pos, groove.top(), sliderSize, groove.height()));
141​ else
142​ return visualRect(option, QRect(groove.left(), groove.top() + pos, groove.width(), sliderSize));
143​ }
144​
145​ case SC_ScrollBarSubPage: {
146​ // handle RTL here to unreflect things if need be
147​ auto slider = visualRect(option, subControlRect(CC_ScrollBar, option, SC_ScrollBarSlider, widget));
148​ auto groove = visualRect(option, subControlRect(CC_ScrollBar, option, SC_ScrollBarGroove, widget));
149​
150​ if (horizontal)
151​ return visualRect(option, QRect(groove.left(), groove.top(), slider.left() - groove.left(), groove.height()));
152​ else
153​ return visualRect(option, QRect(groove.left(), groove.top(), groove.width(), slider.top() - groove.top()));
154​ }
155​
156​ case SC_ScrollBarAddPage: {
157​ // handle RTL here to unreflect things if need be
158​ auto slider = visualRect(option, subControlRect(CC_ScrollBar, option, SC_ScrollBarSlider, widget));
159​ auto groove = visualRect(option, subControlRect(CC_ScrollBar, option, SC_ScrollBarGroove, widget));
160​
161​ if (horizontal)
162​ return visualRect(option, QRect(slider.right() + 1, groove.top(), groove.right() - slider.right(), groove.height()));
163​ else
164​ return visualRect(option, QRect(groove.left(), slider.bottom() + 1, groove.width(), groove.bottom() - slider.bottom()));
165​ }
166​
167​ default:
168​ return ParentStyleClass::subControlRect(CC_ScrollBar, option, subControl, widget);
169​ ;
170​ }
171​}
172​
173​//___________________________________________________________________________________
174​bool Style::drawScrollBarSliderControl(const QStyleOption *option, QPainter *painter, const QWidget *widget) const
175​{
176​ // cast option and check
177​ const auto sliderOption(qstyleoption_cast<const QStyleOptionSlider *>(option));
178​ if (!sliderOption)
179​ return true;
180​
181​ // copy rect and palette
182​ const auto &rect(option->rect);
183​ const auto &palette(option->palette);
184​
185​ // try to understand if anywhere the widget is under mouse, not just the handle, use _animations in case of QWidget, option->styleObject in case of QML
186​#if QT_VERSION >= 0x050000
187​ bool widgetMouseOver((option->state & State_MouseOver));
188​ if (widget)
189​ widgetMouseOver = _animations->scrollBarEngine().isHovered(widget, QStyle::SC_ScrollBarGroove);
190​ else if (option->styleObject)
191​ widgetMouseOver = option->styleObject->property("hover").toBool();
192​#else
193​ const bool widgetMouseOver(_animations->scrollBarEngine().isHovered(widget, QStyle::SC_ScrollBarGroove));
194​#endif
195​
196​ qreal grooveAnimationOpacity(_animations->scrollBarEngine().opacity(widget, QStyle::SC_ScrollBarGroove));
197​ if (grooveAnimationOpacity == AnimationData::OpacityInvalid)
198​ grooveAnimationOpacity = (widgetMouseOver ? 1 : 0);
199​ const qreal handleSize = StyleConfigData::animationsEnabled() ? ((Metrics::ScrollBar_SliderWidth / 2.0) * (1 - grooveAnimationOpacity) + Metrics::ScrollBar_SliderWidth * grooveAnimationOpacity) : (int)Metrics::ScrollBar_SliderWidth;
200​
201​ // define handle rect
202​ QRect handleRect;
203​ const State &state(option->state);
204​ const bool horizontal(state & State_Horizontal);
205​ if (horizontal)
206​ handleRect = centerRect(rect, rect.width(), handleSize);
207​ else
208​ handleRect = centerRect(rect, handleSize, rect.height());
209​
210​ const bool enabled(state & State_Enabled);
211​ const bool mouseOver(enabled && (state & State_MouseOver));
212​
213​ // check focus from relevant parent
214​ const QWidget *parent(scrollBarParent(widget));
215​ const bool hasFocus(enabled && ((widget && widget->hasFocus()) || (parent && parent->hasFocus())));
216​
217​ // enable animation state
218​ const bool handleActive(sliderOption->activeSubControls & SC_ScrollBarSlider);
219​ _animations->scrollBarEngine().updateState(widget, AnimationFocus, hasFocus);
220​
221​ _animations->scrollBarEngine().updateState(widget, AnimationHover, mouseOver && handleActive);
222​
223​ const auto mode(_animations->scrollBarEngine().animationMode(widget, SC_ScrollBarSlider));
224​ const qreal opacity(_animations->scrollBarEngine().opacity(widget, SC_ScrollBarSlider));
225​ auto color = _helper->scrollBarHandleColor(palette, mouseOver, hasFocus, opacity, mode);
226​ if (StyleConfigData::animationsEnabled()) {
227​ color.setAlphaF(color.alphaF() * (0.7 + 0.3 * grooveAnimationOpacity));
228​ }
229​
230​ _helper->renderScrollBarHandle(painter, handleRect, color);
231​ return true;
232​}
233​
234​//___________________________________________________________________________________
235​bool Style::drawScrollBarAddLineControl(const QStyleOption *option, QPainter *painter, const QWidget *widget) const
236​{
237​ // do nothing if no buttons are defined
238​ if (_addLineButtons == NoButton)
239​ return true;
240​
241​ // cast option and check
242​ const auto sliderOption(qstyleoption_cast<const QStyleOptionSlider *>(option));
243​ if (!sliderOption)
244​ return true;
245​
246​ const State &state(option->state);
247​ const bool horizontal(state & State_Horizontal);
248​ const bool reverseLayout(option->direction == Qt::RightToLeft);
249​
250​ // adjust rect, based on number of buttons to be drawn
251​ const auto rect(scrollBarInternalSubControlRect(sliderOption, SC_ScrollBarAddLine));
252​
253​ QColor color;
254​ QStyleOptionSlider copy(*sliderOption);
255​ if (_addLineButtons == DoubleButton) {
256​ if (horizontal) {
257​ // Draw the arrows
258​ const QSize halfSize(rect.width() / 2, rect.height());
259​ const QRect leftSubButton(rect.topLeft(), halfSize);
260​ const QRect rightSubButton(leftSubButton.topRight() + QPoint(1, 0), halfSize);
261​
262​ copy.rect = leftSubButton;
263​ color = scrollBarArrowColor(&copy, reverseLayout ? SC_ScrollBarAddLine : SC_ScrollBarSubLine, widget);
264​ _helper->renderArrow(painter, leftSubButton, color, ArrowLeft);
265​
266​ copy.rect = rightSubButton;
267​ color = scrollBarArrowColor(&copy, reverseLayout ? SC_ScrollBarSubLine : SC_ScrollBarAddLine, widget);
268​ _helper->renderArrow(painter, rightSubButton, color, ArrowRight);
269​
270​ } else {
271​ const QSize halfSize(rect.width(), rect.height() / 2);
272​ const QRect topSubButton(rect.topLeft(), halfSize);
273​ const QRect botSubButton(topSubButton.bottomLeft() + QPoint(0, 1), halfSize);
274​
275​ copy.rect = topSubButton;
276​ color = scrollBarArrowColor(&copy, SC_ScrollBarSubLine, widget);
277​ _helper->renderArrow(painter, topSubButton, color, ArrowUp);
278​
279​ copy.rect = botSubButton;
280​ color = scrollBarArrowColor(&copy, SC_ScrollBarAddLine, widget);
281​ _helper->renderArrow(painter, botSubButton, color, ArrowDown);
282​ }
283​
284​ } else if (_addLineButtons == SingleButton) {
285​ copy.rect = rect;
286​ color = scrollBarArrowColor(&copy, SC_ScrollBarAddLine, widget);
287​ if (horizontal) {
288​ if (reverseLayout)
289​ _helper->renderArrow(painter, rect, color, ArrowLeft);
290​ else
291​ _helper->renderArrow(painter, rect.translated(1, 0), color, ArrowRight);
292​
293​ } else
294​ _helper->renderArrow(painter, rect.translated(0, 1), color, ArrowDown);
295​ }
296​
297​ return true;
298​}
299​
300​//___________________________________________________________________________________
301​bool Style::drawScrollBarSubLineControl(const QStyleOption *option, QPainter *painter, const QWidget *widget) const
302​{
303​ // do nothing if no buttons are set
304​ if (_subLineButtons == NoButton)
305​ return true;
306​
307​ // cast option and check
308​ const auto sliderOption(qstyleoption_cast<const QStyleOptionSlider *>(option));
309​ if (!sliderOption)
310​ return true;
311​
312​ const State &state(option->state);
313​ const bool horizontal(state & State_Horizontal);
314​ const bool reverseLayout(option->direction == Qt::RightToLeft);
315​
316​ // colors
317​ const auto &palette(option->palette);
318​ const auto &background = palette.color(QPalette::Window);
319​
320​ // adjust rect, based on number of buttons to be drawn
321​ const auto rect(scrollBarInternalSubControlRect(sliderOption, SC_ScrollBarSubLine));
322​
323​ QColor color;
324​ QStyleOptionSlider copy(*sliderOption);
325​ if (_subLineButtons == DoubleButton) {
326​ if (horizontal) {
327​ // Draw the arrows
328​ const QSize halfSize(rect.width() / 2, rect.height());
329​ const QRect leftSubButton(rect.topLeft(), halfSize);
330​ const QRect rightSubButton(leftSubButton.topRight() + QPoint(1, 0), halfSize);
331​
332​ copy.rect = leftSubButton;
333​ color = scrollBarArrowColor(&copy, reverseLayout ? SC_ScrollBarAddLine : SC_ScrollBarSubLine, widget);
334​ _helper->renderArrow(painter, leftSubButton, color, ArrowLeft);
335​
336​ copy.rect = rightSubButton;
337​ color = scrollBarArrowColor(&copy, reverseLayout ? SC_ScrollBarSubLine : SC_ScrollBarAddLine, widget);
338​ _helper->renderArrow(painter, rightSubButton, color, ArrowRight);
339​
340​ } else {
341​ const QSize halfSize(rect.width(), rect.height() / 2);
342​ const QRect topSubButton(rect.topLeft(), halfSize);
343​ const QRect botSubButton(topSubButton.bottomLeft() + QPoint(0, 1), halfSize);
344​
345​ copy.rect = topSubButton;
346​ color = scrollBarArrowColor(&copy, SC_ScrollBarSubLine, widget);
347​ _helper->renderArrow(painter, topSubButton, color, ArrowUp);
348​
349​ copy.rect = botSubButton;
350​ color = scrollBarArrowColor(&copy, SC_ScrollBarAddLine, widget);
351​ _helper->renderArrow(painter, botSubButton, color, ArrowDown);
352​ }
353​
354​ } else if (_subLineButtons == SingleButton) {
355​ copy.rect = rect;
356​ color = scrollBarArrowColor(&copy, SC_ScrollBarSubLine, widget);
357​ if (horizontal) {
358​ if (reverseLayout)
359​ _helper->renderArrow(painter, rect.translated(1, 0), color, ArrowRight);
360​ else
361​ _helper->renderArrow(painter, rect, color, ArrowLeft);
362​
363​ } else
364​ _helper->renderArrow(painter, rect, color, ArrowUp);
365​ }
366​
367​ return true;
368​}
369​
370​//______________________________________________________________
371​bool Style::drawScrollBarComplexControl(const QStyleOptionComplex *option, QPainter *painter, const QWidget *widget) const
372​{
373​ // the animation for QStyle::SC_ScrollBarGroove is special: it will animate
374​ // the opacity of everything else as well, included slider and arrows
375​ qreal opacity(_animations->scrollBarEngine().opacity(widget, QStyle::SC_ScrollBarGroove));
376​ const bool animated(StyleConfigData::animationsEnabled() && _animations->scrollBarEngine().isAnimated(widget, AnimationHover, QStyle::SC_ScrollBarGroove));
377​ const bool mouseOver(option->state & State_MouseOver);
378​
379​ if (opacity == AnimationData::OpacityInvalid)
380​ opacity = 1;
381​
382​ // render full groove directly, rather than using the addPage and subPage control element methods
383​ if ((!StyleConfigData::animationsEnabled() || mouseOver || animated) && option->subControls & SC_ScrollBarGroove) {
384​ // retrieve groove rectangle
385​ auto grooveRect(subControlRect(CC_ScrollBar, option, SC_ScrollBarGroove, widget));
386​
387​ const auto &palette(option->palette);
388​ const auto color(_helper->alphaColor(palette.color(QPalette::WindowText), 0.3 * (animated ? opacity : 1)));
389​ const auto &state(option->state);
390​ const bool horizontal(state & State_Horizontal);
391​
392​ if (horizontal)
393​ grooveRect = centerRect(grooveRect, grooveRect.width(), Metrics::ScrollBar_SliderWidth);
394​ else
395​ grooveRect = centerRect(grooveRect, Metrics::ScrollBar_SliderWidth, grooveRect.height());
396​
397​ // render
398​ _helper->renderScrollBarGroove(painter, grooveRect, color);
399​ }
400​
401​ // call base class primitive
402​ ParentStyleClass::drawComplexControl(CC_ScrollBar, option, painter, widget);
403​
404​ return true;
405​}
406​
407​//______________________________________________________________________________
408​const QWidget *Style::scrollBarParent(const QWidget *widget) const
409​{
410​ // check widget and parent
411​ if (!(widget && widget->parentWidget()))
412​ return nullptr;
413​
414​ // try cast to scroll area. Must test both parent and grandparent
415​ QAbstractScrollArea *scrollArea;
416​ if (!(scrollArea = qobject_cast<QAbstractScrollArea *>(widget->parentWidget()))) {
417​ scrollArea = qobject_cast<QAbstractScrollArea *>(widget->parentWidget()->parentWidget());
418​ }
419​
420​ // check scrollarea
421​ if (scrollArea && (widget == scrollArea->verticalScrollBar() || widget == scrollArea->horizontalScrollBar())) {
422​ return scrollArea;
423​
424​ } else if (widget->parentWidget()->inherits("KTextEditor::View")) {
425​ return widget->parentWidget();
426​
427​ } else
428​ return nullptr;
429​}
430​
431​//______________________________________________________________________________
432​QColor Style::scrollBarArrowColor(const QStyleOptionSlider *option, const SubControl &control, const QWidget *widget) const
433​{
434​ const auto &rect(option->rect);
435​ const auto &palette(option->palette);
436​ auto color(_helper->arrowColor(palette, QPalette::WindowText));
437​
438​ bool widgetMouseOver((option->state & State_MouseOver));
439​ if (widget)
440​ widgetMouseOver = widget->underMouse();
441​#if QT_VERSION >= 0x050000
442​ // in case this QStyle is used by QQuickControls QStyle wrapper
443​ else if (option->styleObject)
444​ widgetMouseOver = option->styleObject->property("hover").toBool();
445​#endif
446​
447​ // check enabled state
448​ const bool enabled(option->state & State_Enabled);
449​ if (!enabled) {
450​ if (StyleConfigData::animationsEnabled()) {
451​ // finally, global opacity when ScrollBarShowOnMouseOver
452​ const qreal globalOpacity(_animations->scrollBarEngine().opacity(widget, QStyle::SC_ScrollBarGroove));
453​ if (globalOpacity >= 0)
454​ color.setAlphaF(globalOpacity);
455​ // no mouse over and no animation in progress, don't draw arrows at all
456​ else if (!widgetMouseOver)
457​ return Qt::transparent;
458​ }
459​ return color;
460​ }
461​
462​ if ((control == SC_ScrollBarSubLine && option->sliderValue == option->minimum) || (control == SC_ScrollBarAddLine && option->sliderValue == option->maximum)) {
463​ // manually disable arrow, to indicate that scrollbar is at limit
464​ color = _helper->arrowColor(palette, QPalette::Disabled, QPalette::WindowText);
465​ if (StyleConfigData::animationsEnabled()) {
466​ // finally, global opacity when ScrollBarShowOnMouseOver
467​ const qreal globalOpacity(_animations->scrollBarEngine().opacity(widget, QStyle::SC_ScrollBarGroove));
468​ if (globalOpacity >= 0)
469​ color.setAlphaF(globalOpacity);
470​ // no mouse over and no animation in progress, don't draw arrows at all
471​ else if (!widgetMouseOver)
472​ return Qt::transparent;
473​ }
474​ return color;
475​ }
476​
477​ const bool mouseOver(_animations->scrollBarEngine().isHovered(widget, control));
478​ const bool animated(_animations->scrollBarEngine().isAnimated(widget, AnimationHover, control));
479​ const qreal opacity(_animations->scrollBarEngine().opacity(widget, control));
480​
481​ // retrieve mouse position from engine
482​ QPoint position(mouseOver ? _animations->scrollBarEngine().position(widget) : QPoint(-1, -1));
483​ if (mouseOver && rect.contains(position)) {
484​ /*
485​ * need to update the arrow controlRect on fly because there is no
486​ * way to get it from the styles directly, outside of repaint events
487​ */
488​ _animations->scrollBarEngine().setSubControlRect(widget, control, rect);
489​ }
490​
491​ if (rect.intersects(_animations->scrollBarEngine().subControlRect(widget, control))) {
492​ auto highlight = _helper->hoverColor(palette);
493​ if (animated) {
494​ color = KColorUtils::mix(color, highlight, opacity);
495​
496​ } else if (mouseOver) {
497​ color = highlight;
498​ }
499​ }
500​
501​ if (StyleConfigData::animationsEnabled()) {
502​ // finally, global opacity when ScrollBarShowOnMouseOver
503​ const qreal globalOpacity(_animations->scrollBarEngine().opacity(widget, QStyle::SC_ScrollBarGroove));
504​ if (globalOpacity >= 0)
505​ color.setAlphaF(globalOpacity);
506​ // no mouse over and no animation in progress, don't draw arrows at all
507​ else if (!widgetMouseOver)
508​ return Qt::transparent;
509​ }
510​
511​ return color;
512​}
513​
514​}