tdesktop/Telegram/SourceFiles/ui/wrap/vertical_layout.cpp
2019-01-17 12:21:29 +04:00

187 lines
4.4 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "ui/wrap/vertical_layout.h"
namespace Ui {
QMargins VerticalLayout::getMargins() const {
auto result = QMargins();
if (!_rows.empty()) {
auto &top = _rows.front();
auto topMargin = top.widget->getMargins().top();
result.setTop(
qMax(topMargin - top.margin.top(), 0));
auto &bottom = _rows.back();
auto bottomMargin = bottom.widget->getMargins().bottom();
result.setBottom(
qMax(bottomMargin - bottom.margin.bottom(), 0));
for (auto &row : _rows) {
auto margins = row.widget->getMargins();
result.setLeft(qMax(
margins.left() - row.margin.left(),
result.left()));
result.setRight(qMax(
margins.right() - row.margin.right(),
result.right()));
}
}
return result;
}
int VerticalLayout::naturalWidth() const {
auto result = 0;
for (auto &row : _rows) {
const auto natural = row.widget->naturalWidth();
if (natural < 0) {
return natural;
}
accumulate_max(
result,
row.margin.left() + natural + row.margin.right());
}
return result;
}
int VerticalLayout::resizeGetHeight(int newWidth) {
_inResize = true;
auto guard = gsl::finally([&] { _inResize = false; });
auto margins = getMargins();
auto result = 0;
for (auto &row : _rows) {
updateChildGeometry(
margins,
row.widget,
row.margin,
newWidth,
result);
result += row.margin.top()
+ row.widget->heightNoMargins()
+ row.margin.bottom();
}
return result;
}
void VerticalLayout::visibleTopBottomUpdated(
int visibleTop,
int visibleBottom) {
for (auto &row : _rows) {
setChildVisibleTopBottom(
row.widget,
visibleTop,
visibleBottom);
}
}
void VerticalLayout::updateChildGeometry(
const style::margins &margins,
RpWidget *child,
const style::margins &margin,
int width,
int top) const {
auto availRowWidth = width
- margin.left()
- margin.right();
child->resizeToNaturalWidth(availRowWidth);
child->moveToLeft(
margins.left() + margin.left(),
margins.top() + margin.top() + top,
width);
}
RpWidget *VerticalLayout::insertChild(
int atPosition,
object_ptr<RpWidget> child,
const style::margins &margin) {
Expects(atPosition >= 0 && atPosition <= _rows.size());
if (const auto weak = AttachParentChild(this, child)) {
_rows.insert(
begin(_rows) + atPosition,
{ std::move(child), margin });
const auto margins = getMargins();
updateChildGeometry(
margins,
weak,
margin,
width() - margins.left() - margins.right(),
height() - margins.top() - margins.bottom());
weak->heightValue(
) | rpl::start_with_next_done([=] {
if (!_inResize) {
childHeightUpdated(weak);
}
}, [=] {
removeChild(weak);
}, lifetime());
return weak;
}
return nullptr;
}
void VerticalLayout::childHeightUpdated(RpWidget *child) {
auto it = ranges::find_if(_rows, [child](const Row &row) {
return (row.widget == child);
});
auto margins = getMargins();
auto top = [&] {
if (it == _rows.begin()) {
return margins.top();
}
auto prev = it - 1;
return prev->widget->bottomNoMargins() + prev->margin.bottom();
}() - margins.top();
for (auto end = _rows.end(); it != end; ++it) {
auto &row = *it;
auto margin = row.margin;
auto widget = row.widget.data();
widget->moveToLeft(
margins.left() + margin.left(),
margins.top() + top + margin.top());
top += margin.top()
+ widget->heightNoMargins()
+ margin.bottom();
}
resize(width(), margins.top() + top + margins.bottom());
}
void VerticalLayout::removeChild(RpWidget *child) {
auto it = ranges::find_if(_rows, [child](const Row &row) {
return (row.widget == child);
});
auto end = _rows.end();
Assert(it != end);
auto margins = getMargins();
auto top = [&] {
if (it == _rows.begin()) {
return margins.top();
}
auto prev = it - 1;
return prev->widget->bottomNoMargins() + prev->margin.bottom();
}() - margins.top();
for (auto next = it + 1; next != end; ++next) {
auto &row = *next;
auto margin = row.margin;
auto widget = row.widget.data();
widget->moveToLeft(
margins.left() + margin.left(),
margins.top() + top + margin.top());
top += margin.top()
+ widget->heightNoMargins()
+ margin.bottom();
}
it->widget = nullptr;
_rows.erase(it);
resize(width(), margins.top() + top + margins.bottom());
}
} // namespace Ui