127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
/***
|
|
|
|
Olive - Non-Linear Video Editor
|
|
Copyright (C) 2019 Olive Team
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
***/
|
|
|
|
#include "resizablescrollbar.h"
|
|
|
|
#include <QMouseEvent>
|
|
#include <QStyle>
|
|
#include <QStyleOptionSlider>
|
|
|
|
#include "debug.h"
|
|
|
|
#define RESIZE_HANDLE_SIZE 10
|
|
|
|
ResizableScrollBar::ResizableScrollBar(QWidget *parent) :
|
|
QScrollBar(parent),
|
|
resize_init(false),
|
|
resize_proc(false)
|
|
{
|
|
setSingleStep(20);
|
|
setMaximum(0);
|
|
setMouseTracking(true);
|
|
}
|
|
|
|
bool ResizableScrollBar::is_resizing() {
|
|
return resize_proc;
|
|
}
|
|
|
|
void ResizableScrollBar::resizeEvent(QResizeEvent *event) {
|
|
setPageStep(event->size().width());
|
|
}
|
|
|
|
void ResizableScrollBar::mousePressEvent(QMouseEvent *e) {
|
|
if (resize_init) {
|
|
QStyleOptionSlider opt;
|
|
initStyleOption(&opt);
|
|
|
|
QRect sr = style()->subControlRect(QStyle::CC_ScrollBar, &opt,
|
|
QStyle::SC_ScrollBarSlider, this);
|
|
|
|
resize_proc = true;
|
|
resize_start = e->pos().x();
|
|
|
|
resize_start_max = maximum();
|
|
resize_start_width = sr.width();
|
|
} else {
|
|
QScrollBar::mousePressEvent(e);
|
|
}
|
|
}
|
|
|
|
void ResizableScrollBar::mouseMoveEvent(QMouseEvent *e) {
|
|
QStyleOptionSlider opt;
|
|
initStyleOption(&opt);
|
|
|
|
QRect sr = style()->subControlRect(QStyle::CC_ScrollBar, &opt,
|
|
QStyle::SC_ScrollBarSlider, this);
|
|
QRect gr = style()->subControlRect(QStyle::CC_ScrollBar, &opt,
|
|
QStyle::SC_ScrollBarGroove, this);
|
|
|
|
if (resize_proc) {
|
|
int diff = (e->pos().x() - resize_start);
|
|
if (resize_top) diff = -diff;
|
|
double scale = double(sr.width())/double(sr.width()+diff);
|
|
if (!qIsInf(scale) && !qIsNull(scale)) {
|
|
emit resize_move(scale);
|
|
resize_start = e->pos().x();
|
|
|
|
if (resize_top) {
|
|
int slider_min = gr.x();
|
|
int slider_max = gr.right() - (sr.width()+diff);
|
|
int val = QStyle::sliderValueFromPosition(minimum(), maximum(), e->pos().x() - slider_min, slider_max - slider_min, opt.upsideDown);
|
|
|
|
setValue(val);
|
|
} else {
|
|
setValue(qRound(value() * scale));
|
|
}
|
|
}
|
|
} else {
|
|
bool new_resize_init = false;
|
|
|
|
if ((orientation() == Qt::Horizontal && e->pos().x() > sr.left()-RESIZE_HANDLE_SIZE && e->pos().x() < sr.left()+RESIZE_HANDLE_SIZE)
|
|
|| (orientation() == Qt::Vertical && e->pos().y() > sr.top()-RESIZE_HANDLE_SIZE && e->pos().y() < sr.top()+RESIZE_HANDLE_SIZE)) {
|
|
new_resize_init = true;
|
|
resize_top = true;
|
|
} else if ((orientation() == Qt::Horizontal && e->pos().x() > sr.right()-RESIZE_HANDLE_SIZE && e->pos().x() < sr.right()+RESIZE_HANDLE_SIZE)
|
|
|| (orientation() == Qt::Vertical && e->pos().y() > sr.bottom()-RESIZE_HANDLE_SIZE && e->pos().y() < sr.bottom()+RESIZE_HANDLE_SIZE)) {
|
|
new_resize_init = true;
|
|
resize_top = false;
|
|
}
|
|
|
|
if (resize_init != new_resize_init) {
|
|
if (new_resize_init) {
|
|
setCursor(Qt::SizeHorCursor);
|
|
} else {
|
|
unsetCursor();
|
|
}
|
|
resize_init = new_resize_init;
|
|
}
|
|
|
|
QScrollBar::mouseMoveEvent(e);
|
|
}
|
|
}
|
|
|
|
void ResizableScrollBar::mouseReleaseEvent(QMouseEvent *e) {
|
|
if (resize_proc) {
|
|
resize_proc = false;
|
|
} else {
|
|
QScrollBar::mouseReleaseEvent(e);
|
|
}
|
|
}
|