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FileDiffSliderWidget.cpp
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FileDiffSliderWidget.cpp
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#include "FileDiffSliderWidget.h"
#include "MainWindow.h"
#include <QPainter>
#include <QMouseEvent>
FileDiffSliderWidget::FileDiffSliderWidget(QWidget *parent)
: QWidget(parent)
{
}
void FileDiffSliderWidget::updatePixmap()
{
MainWindow *mw = qobject_cast<MainWindow *>(window());
Q_ASSERT(mw);
left_pixmap = mw->makeDiffPixmap(ViewType::Left, 8, height());
right_pixmap = mw->makeDiffPixmap(ViewType::Right, 8, height());
}
void FileDiffSliderWidget::paintEvent(QPaintEvent *)
{
if (!visible) return;
if (scroll_total < 1) return;
if (left_pixmap.isNull() || right_pixmap.isNull()) {
updatePixmap();
}
int w;
w = left_pixmap.width();
QPainter pr(this);
pr.fillRect(w, 0, 4, height(), QColor(240, 240, 240));
pr.drawPixmap(0, 0, left_pixmap);
pr.drawPixmap(w + 4, 0, right_pixmap);
int y = scroll_value * height() / scroll_total;
int h = scroll_visible_size * height() / scroll_total;
if (h < 2) h = 2;
pr.fillRect(w + 1, y, 2, h, Qt::black);
}
void FileDiffSliderWidget::resizeEvent(QResizeEvent *)
{
clear(visible);
}
void FileDiffSliderWidget::scroll(int pos)
{
int v = pos;
v = v * scroll_total / height() - scroll_visible_size / 2;
if (v < 0) v = 0;
emit valueChanged(v);
}
void FileDiffSliderWidget::mousePressEvent(QMouseEvent *e)
{
if (visible && e->button() == Qt::LeftButton) {
scroll(e->pos().y());
}
}
void FileDiffSliderWidget::mouseMoveEvent(QMouseEvent *e)
{
if (visible && (e->buttons() & Qt::LeftButton)) {
scroll(e->pos().y());
}
}
void FileDiffSliderWidget::wheelEvent(QWheelEvent *e)
{
int delta = e->delta();
if (delta < 0) {
delta = -delta / 40;
if (delta == 0) delta = 1;
emit scrollByWheel(delta);
} else if (delta > 0) {
delta /= 40;
if (delta == 0) delta = 1;
emit scrollByWheel(-delta);
}
}
void FileDiffSliderWidget::clear(bool v)
{
left_pixmap = QPixmap();
right_pixmap = QPixmap();
visible = v;
update();
}
void FileDiffSliderWidget::setScrollPos(int total, int value, int size)
{
scroll_total = total;
scroll_value = value;
scroll_visible_size = size;
visible = (scroll_total > 0) && (scroll_visible_size > 0);
update();
}

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FileDiffSliderWidget.cpp (2 KB)

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