1/*
2 This file is part of the KDE libraries
3 SPDX-FileCopyrightText: 1997 Martin Jones <mjones@kde.org>
4 SPDX-FileCopyrightText: 1999 Cristian Tibirna <ctibirna@kde.org>
5
6 SPDX-License-Identifier: LGPL-2.0-or-later
7*/
8
9#include "kcolorbutton.h"
10
11#include <QApplication>
12#include <QClipboard>
13#include <QColorDialog>
14#include <QDrag>
15#include <QMimeData>
16#include <QMouseEvent>
17#include <QPainter>
18#include <QPointer>
19#include <QStyle>
20#include <QStyleOptionButton>
21#include <qdrawutil.h>
22
23class KColorButtonPrivate
24{
25public:
26 KColorButtonPrivate(KColorButton *qq);
27
28 void chooseColor();
29 void colorChosen();
30
31 KColorButton *q;
32 QColor m_defaultColor;
33 bool m_bdefaultColor : 1;
34 bool m_alphaChannel : 1;
35
36 QColor col;
37 QPoint mPos;
38
39 QPointer<QColorDialog> dialogPtr;
40
41 void initStyleOption(QStyleOptionButton *opt) const;
42};
43
44/////////////////////////////////////////////////////////////////////
45// Functions duplicated from KColorMimeData
46// Should be kept in sync
47void populateMimeData(QMimeData *mimeData, const QColor &color)
48{
49 mimeData->setColorData(color);
50 mimeData->setText(color.name());
51}
52
53bool canDecode(const QMimeData *mimeData)
54{
55 if (mimeData->hasColor()) {
56 return true;
57 }
58 if (mimeData->hasText()) {
59 const QString colorName = mimeData->text();
60 if ((colorName.length() >= 4) && (colorName[0] == QLatin1Char('#'))) {
61 return true;
62 }
63 }
64 return false;
65}
66
67QColor fromMimeData(const QMimeData *mimeData)
68{
69 if (mimeData->hasColor()) {
70 return mimeData->colorData().value<QColor>();
71 }
72 if (canDecode(mimeData)) {
73 return QColor(mimeData->text());
74 }
75 return QColor();
76}
77
78QDrag *createDrag(const QColor &color, QObject *dragsource)
79{
80 QDrag *drag = new QDrag(dragsource);
81 QMimeData *mime = new QMimeData;
82 populateMimeData(mimeData: mime, color);
83 drag->setMimeData(mime);
84 QPixmap colorpix(25, 20);
85 colorpix.fill(fillColor: color);
86 QPainter p(&colorpix);
87 p.setPen(Qt::black);
88 p.drawRect(x: 0, y: 0, w: 24, h: 19);
89 p.end();
90 drag->setPixmap(colorpix);
91 drag->setHotSpot(QPoint(-5, -7));
92 return drag;
93}
94/////////////////////////////////////////////////////////////////////
95
96KColorButtonPrivate::KColorButtonPrivate(KColorButton *qq)
97 : q(qq)
98{
99 m_bdefaultColor = false;
100 m_alphaChannel = false;
101 q->setAcceptDrops(true);
102
103 QObject::connect(sender: q, signal: &KColorButton::clicked, context: q, slot: [this]() {
104 chooseColor();
105 });
106}
107
108KColorButton::KColorButton(QWidget *parent)
109 : QPushButton(parent)
110 , d(new KColorButtonPrivate(this))
111{
112}
113
114KColorButton::KColorButton(const QColor &c, QWidget *parent)
115 : QPushButton(parent)
116 , d(new KColorButtonPrivate(this))
117{
118 d->col = c;
119}
120
121KColorButton::KColorButton(const QColor &c, const QColor &defaultColor, QWidget *parent)
122 : QPushButton(parent)
123 , d(new KColorButtonPrivate(this))
124{
125 d->col = c;
126 setDefaultColor(defaultColor);
127}
128
129KColorButton::~KColorButton() = default;
130
131QColor KColorButton::color() const
132{
133 return d->col;
134}
135
136void KColorButton::setColor(const QColor &c)
137{
138 if (d->col != c) {
139 d->col = c;
140 update();
141 Q_EMIT changed(newColor: d->col);
142 }
143}
144
145void KColorButton::setAlphaChannelEnabled(bool alpha)
146{
147 d->m_alphaChannel = alpha;
148}
149
150bool KColorButton::isAlphaChannelEnabled() const
151{
152 return d->m_alphaChannel;
153}
154
155QColor KColorButton::defaultColor() const
156{
157 return d->m_defaultColor;
158}
159
160void KColorButton::setDefaultColor(const QColor &c)
161{
162 d->m_bdefaultColor = c.isValid();
163 d->m_defaultColor = c;
164}
165
166void KColorButtonPrivate::initStyleOption(QStyleOptionButton *opt) const
167{
168 opt->initFrom(w: q);
169 opt->state |= q->isDown() ? QStyle::State_Sunken : QStyle::State_Raised;
170 opt->features = QStyleOptionButton::None;
171 if (q->isDefault()) {
172 opt->features |= QStyleOptionButton::DefaultButton;
173 }
174 opt->text.clear();
175 opt->icon = QIcon();
176}
177
178void KColorButton::paintEvent(QPaintEvent *)
179{
180 QPainter painter(this);
181 QStyle *style = QWidget::style();
182
183 // First, we need to draw the bevel.
184 QStyleOptionButton butOpt;
185 d->initStyleOption(opt: &butOpt);
186 style->drawControl(element: QStyle::CE_PushButtonBevel, opt: &butOpt, p: &painter, w: this);
187
188 // OK, now we can muck around with drawing out pretty little color box
189 // First, sort out where it goes
190 QRect labelRect = style->subElementRect(subElement: QStyle::SE_PushButtonContents, option: &butOpt, widget: this);
191 int shift = style->pixelMetric(metric: QStyle::PM_ButtonMargin, option: &butOpt, widget: this) / 2;
192 labelRect.adjust(dx1: shift, dy1: shift, dx2: -shift, dy2: -shift);
193 int x;
194 int y;
195 int w;
196 int h;
197 labelRect.getRect(ax: &x, ay: &y, aw: &w, ah: &h);
198
199 if (isChecked() || isDown()) {
200 x += style->pixelMetric(metric: QStyle::PM_ButtonShiftHorizontal, option: &butOpt, widget: this);
201 y += style->pixelMetric(metric: QStyle::PM_ButtonShiftVertical, option: &butOpt, widget: this);
202 }
203
204 QColor fillCol = isEnabled() ? d->col : palette().color(cr: backgroundRole());
205 qDrawShadePanel(p: &painter, x, y, w, h, pal: palette(), sunken: true, lineWidth: 1, fill: nullptr);
206 if (fillCol.isValid()) {
207 const QRect rect(x + 1, y + 1, w - 2, h - 2);
208 if (fillCol.alpha() < 255) {
209 QPixmap chessboardPattern(16, 16);
210 QPainter patternPainter(&chessboardPattern);
211 patternPainter.fillRect(x: 0, y: 0, w: 8, h: 8, c: Qt::black);
212 patternPainter.fillRect(x: 8, y: 8, w: 8, h: 8, c: Qt::black);
213 patternPainter.fillRect(x: 0, y: 8, w: 8, h: 8, c: Qt::white);
214 patternPainter.fillRect(x: 8, y: 0, w: 8, h: 8, c: Qt::white);
215 patternPainter.end();
216 painter.fillRect(rect, QBrush(chessboardPattern));
217 }
218 painter.fillRect(rect, color: fillCol);
219 }
220
221 if (hasFocus()) {
222 QRect focusRect = style->subElementRect(subElement: QStyle::SE_PushButtonFocusRect, option: &butOpt, widget: this);
223 QStyleOptionFocusRect focusOpt;
224 focusOpt.initFrom(w: this);
225 focusOpt.rect = focusRect;
226 focusOpt.backgroundColor = palette().window().color();
227 style->drawPrimitive(pe: QStyle::PE_FrameFocusRect, opt: &focusOpt, p: &painter, w: this);
228 }
229}
230
231QSize KColorButton::sizeHint() const
232{
233 QStyleOptionButton opt;
234 d->initStyleOption(opt: &opt);
235 return style()->sizeFromContents(ct: QStyle::CT_PushButton, opt: &opt, contentsSize: QSize(40, 15), w: this);
236}
237
238QSize KColorButton::minimumSizeHint() const
239{
240 QStyleOptionButton opt;
241 d->initStyleOption(opt: &opt);
242 return style()->sizeFromContents(ct: QStyle::CT_PushButton, opt: &opt, contentsSize: QSize(3, 3), w: this);
243}
244
245void KColorButton::dragEnterEvent(QDragEnterEvent *event)
246{
247 event->setAccepted(canDecode(mimeData: event->mimeData()) && isEnabled());
248}
249
250void KColorButton::dropEvent(QDropEvent *event)
251{
252 QColor c = fromMimeData(mimeData: event->mimeData());
253 if (c.isValid()) {
254 setColor(c);
255 }
256}
257
258void KColorButton::keyPressEvent(QKeyEvent *e)
259{
260 int key = e->key() | e->modifiers();
261
262 if (QKeySequence::keyBindings(key: QKeySequence::Copy).contains(t: key)) {
263 QMimeData *mime = new QMimeData;
264 populateMimeData(mimeData: mime, color: color());
265 QApplication::clipboard()->setMimeData(data: mime, mode: QClipboard::Clipboard);
266 } else if (QKeySequence::keyBindings(key: QKeySequence::Paste).contains(t: key)) {
267 QColor color = fromMimeData(mimeData: QApplication::clipboard()->mimeData(mode: QClipboard::Clipboard));
268 setColor(color);
269 } else {
270 QPushButton::keyPressEvent(e);
271 }
272}
273
274void KColorButton::mousePressEvent(QMouseEvent *e)
275{
276 d->mPos = e->pos();
277 QPushButton::mousePressEvent(e);
278}
279
280void KColorButton::mouseMoveEvent(QMouseEvent *e)
281{
282 if ((e->buttons() & Qt::LeftButton) && (e->pos() - d->mPos).manhattanLength() > QApplication::startDragDistance()) {
283 createDrag(color: color(), dragsource: this)->exec();
284 setDown(false);
285 }
286}
287
288void KColorButtonPrivate::chooseColor()
289{
290 QColorDialog *dialog = dialogPtr.data();
291 if (dialog) {
292 dialog->show();
293 dialog->raise();
294 dialog->activateWindow();
295 return;
296 }
297
298 dialog = new QColorDialog(q);
299 dialog->setCurrentColor(q->color());
300 dialog->setOption(option: QColorDialog::ShowAlphaChannel, on: m_alphaChannel);
301 dialog->setAttribute(Qt::WA_DeleteOnClose);
302 QObject::connect(sender: dialog, signal: &QDialog::accepted, context: q, slot: [this]() {
303 colorChosen();
304 });
305 dialogPtr = dialog;
306 dialog->show();
307}
308
309void KColorButtonPrivate::colorChosen()
310{
311 QColorDialog *dialog = dialogPtr.data();
312 if (!dialog) {
313 return;
314 }
315
316 if (dialog->selectedColor().isValid()) {
317 q->setColor(dialog->selectedColor());
318 } else if (m_bdefaultColor) {
319 q->setColor(m_defaultColor);
320 }
321}
322
323#include "moc_kcolorbutton.cpp"
324

source code of kwidgetsaddons/src/kcolorbutton.cpp