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FileDiffSliderWidget.cpp
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FileDiffSliderWidget.cpp
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#include "FileDiffSliderWidget.h"
#include "common/misc.h"
#include <QPainter>
#include <QMouseEvent>
#include <QDebug>
#include "ApplicationGlobal.h"
#include "TextEditorTheme.h"
struct FileDiffSliderWidget::Private {
bool visible = false;
int scroll_total = 0;
int scroll_value = 0;
int scroll_page_size = 0;
QPixmap left_pixmap;
QPixmap right_pixmap;
int wheel_delta = 0;
fn_pixmap_maker_t pixmap_maker;
ThemePtr theme;
};
FileDiffSliderWidget::FileDiffSliderWidget(QWidget *parent)
: QWidget(parent)
, m(new Private)
{
}
FileDiffSliderWidget::~FileDiffSliderWidget()
{
delete m;
}
void FileDiffSliderWidget::init(fn_pixmap_maker_t pixmap_maker, ThemePtr theme)
{
m->pixmap_maker = pixmap_maker;
m->theme = theme;
}
QPixmap FileDiffSliderWidget::makeDiffPixmap(DiffPane pane, int width, int height)
{
if (m->pixmap_maker) {
return m->pixmap_maker(pane, width, height);
}
return QPixmap();
}
void FileDiffSliderWidget::updatePixmap()
{
m->left_pixmap = makeDiffPixmap(DiffPane::Left, 1, height());
m->right_pixmap = makeDiffPixmap(DiffPane::Right, 1, height());
}
QPixmap FileDiffSliderWidget::makeDiffPixmap(int width, int height, TextDiffLineList const &lines, ThemePtr theme)
{
auto MakePixmap = [&](TextDiffLineList const &lines, int w, int h){
const int scale = 1;
QPixmap pixmap = QPixmap(w, h * scale);
pixmap.fill(theme->diff_slider_normal_bg);
QPainter pr(&pixmap);
auto Loop = [&](std::function<QColor(TextDiffLine::Type)> getcolor){
int i = 0;
while (i < lines.size()) {
auto type = (TextDiffLine::Type)lines[i].type;
int j = i + 1;
if (type != TextDiffLine::Normal) {
while (j < lines.size()) {
if (lines[j].type != type) break;
j++;
}
int y = i * pixmap.height() / lines.size();
int z = j * pixmap.height() / lines.size();
if (z == y) z = y + 1;
QColor color = getcolor(type);
if (color.isValid()) pr.fillRect(0, y, w, z - y, color);
}
i = j;
}
};
Loop([&](TextDiffLine::Type t)->QColor{
switch (t) {
case TextDiffLine::Unknown: return theme->diff_slider_unknown_bg;
}
return QColor();
});
Loop([&](TextDiffLine::Type t)->QColor{
switch (t) {
case TextDiffLine::Add: return theme->diff_slider_add_bg;
case TextDiffLine::Del: return theme->diff_slider_del_bg;
}
return QColor();
});
if (scale == 1) return pixmap;
return pixmap.scaled(w, h, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
};
return MakePixmap(lines, width, height);
}
void FileDiffSliderWidget::paintEvent(QPaintEvent *)
{
if (!m->visible) return;
if (m->scroll_total < 1) return;
if (m->left_pixmap.isNull() || m->right_pixmap.isNull()) {
updatePixmap();
}
QPainter pr(this);
int w = (width() - 4) / 2;
{
int h = height();
pr.fillRect(w, 0, 4, height(), QColor(240, 240, 240));
int sw = m->left_pixmap.width();
int sh = m->left_pixmap.height();
pr.drawPixmap(0, 0, w, h, m->left_pixmap, 0, 0, sw, sh);
pr.drawPixmap(w + 4, 0, w, h, m->right_pixmap, 0, 0, sw, sh);
}
pr.fillRect(w, 0, 4, height(), palette().color(QPalette::Window));
if (m->scroll_page_size > 0 && m->scroll_total > 0) {
int y = m->scroll_value * height() / m->scroll_total;
int h = m->scroll_page_size * height() / m->scroll_total;
if (h < 2) h = 2;
pr.fillRect(w + 1, y, 2, h, m->theme->diff_slider_handle);
}
if (hasFocus()) {
QPainter pr(this);
misc::drawFrame(&pr, 0, 0, width(), height(), QColor(0, 128, 255, 128));
}
}
void FileDiffSliderWidget::resizeEvent(QResizeEvent *)
{
clear(m->visible);
}
void FileDiffSliderWidget::internalSetValue(int v)
{
int max = m->scroll_total - m->scroll_page_size / 2;
if (v > max) {
v = max;
}
if (v < 0) {
v = 0;
}
m->scroll_value = v;
}
void FileDiffSliderWidget::setValue(int v)
{
internalSetValue(v);
update();
emit valueChanged(m->scroll_value);
}
void FileDiffSliderWidget::scroll_(int pos)
{
int v = pos;
v = v * m->scroll_total / height() - m->scroll_page_size / 2;
setValue(v);
}
void FileDiffSliderWidget::mousePressEvent(QMouseEvent *e)
{
if (m->visible && e->button() == Qt::LeftButton) {
scroll_(e->pos().y());
}
}
void FileDiffSliderWidget::mouseMoveEvent(QMouseEvent *e)
{
if (m->visible && (e->buttons() & Qt::LeftButton)) {
scroll_(e->pos().y());
}
}
void FileDiffSliderWidget::wheelEvent(QWheelEvent *e)
{
int pos = 0;
m->wheel_delta += e->delta();
while (m->wheel_delta >= 40) {
m->wheel_delta -= 40;
pos--;
}
while (m->wheel_delta <= -40) {
m->wheel_delta += 40;
pos++;
}
if (pos != 0) {
setValue(m->scroll_value + pos);
}
}
void FileDiffSliderWidget::clear(bool v)
{
m->left_pixmap = QPixmap();
m->right_pixmap = QPixmap();
m->visible = v;
update();
}
void FileDiffSliderWidget::setScrollPos(int total, int value, int size)
{
m->scroll_total = total;
m->scroll_page_size = size;
internalSetValue(value);
m->visible = (m->scroll_total > 0) && (m->scroll_page_size > 0);
update();
}

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FileDiffSliderWidget.cpp (4 KB)

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