158 lines
3.6 KiB
C++
158 lines
3.6 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2021 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "resizablescrollbar.h"
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#include <QDebug>
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#include <QMouseEvent>
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#include <QStyle>
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#include <QStyleOptionSlider>
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#include "common/range.h"
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namespace olive {
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const int ResizableScrollBar::kHandleWidth = 10;
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ResizableScrollBar::ResizableScrollBar(QWidget *parent) :
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QScrollBar(parent)
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{
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Init();
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}
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ResizableScrollBar::ResizableScrollBar(Qt::Orientation orientation, QWidget *parent):
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QScrollBar(orientation, parent)
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{
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Init();
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}
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void ResizableScrollBar::mousePressEvent(QMouseEvent *event)
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{
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if (mouse_handle_state_ == kNotInHandle) {
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QScrollBar::mousePressEvent(event);
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} else {
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dragging_ = true;
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drag_start_point_ = GetActiveMousePos(event);
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emit ResizeBegan(GetActiveBarSize(), (mouse_handle_state_ == kInTopHandle));
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}
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}
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void ResizableScrollBar::mouseMoveEvent(QMouseEvent *event)
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{
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QRect sr = GetScrollBarRect();
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if (dragging_) {
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// Determine how much the cursor has moved
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int mouse_movement = GetActiveMousePos(event) - drag_start_point_;
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emit ResizeMoved(mouse_movement);
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} else {
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int mouse_pos, top, bottom;
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Qt::CursorShape target_cursor;
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mouse_pos = GetActiveMousePos(event);
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if (orientation() == Qt::Horizontal) {
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top = sr.left();
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bottom = sr.right();
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target_cursor = Qt::SizeHorCursor;
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} else {
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top = sr.top();
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bottom = sr.bottom();
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target_cursor = Qt::SizeVerCursor;
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}
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if (InRange(mouse_pos, top, kHandleWidth)) {
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mouse_handle_state_ = kInTopHandle;
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} else if (InRange(mouse_pos, bottom, kHandleWidth)) {
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mouse_handle_state_ = kInBottomHandle;
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} else {
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mouse_handle_state_ = kNotInHandle;
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}
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if (mouse_handle_state_ == kNotInHandle) {
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unsetCursor();
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} else {
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setCursor(target_cursor);
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}
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QScrollBar::mouseMoveEvent(event);
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}
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}
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void ResizableScrollBar::mouseReleaseEvent(QMouseEvent *event)
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{
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if (dragging_) {
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dragging_ = false;
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emit ResizeEnded();
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} else {
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QScrollBar::mouseReleaseEvent(event);
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}
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}
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QRect ResizableScrollBar::GetScrollBarRect()
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{
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// Initialize "style option". I don't know what this does, I just ripped it straight from
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// Qt source code
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QStyleOptionSlider opt;
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initStyleOption(&opt);
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// Determine rect of slider bar
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return style()->subControlRect(QStyle::CC_ScrollBar, &opt,
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QStyle::SC_ScrollBarSlider, this);
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}
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void ResizableScrollBar::Init()
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{
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setSingleStep(20);
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setMaximum(0);
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setMouseTracking(true);
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mouse_handle_state_= kNotInHandle;
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dragging_ = false;
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}
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int ResizableScrollBar::GetActiveMousePos(QMouseEvent *event)
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{
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if (orientation() == Qt::Horizontal) {
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return event->pos().x();
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} else {
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return event->pos().y();
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}
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}
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int ResizableScrollBar::GetActiveBarSize()
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{
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QRect sr = GetScrollBarRect();
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if (orientation() == Qt::Horizontal) {
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return sr.width();
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} else {
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return sr.height();
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}
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}
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}
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