tdesktop/Telegram/SourceFiles/dropdown.cpp

/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org

Telegram Desktop 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.

It 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.

In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.

Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2016 John Preston, https://desktop.telegram.org
*/
#include "stdafx.h"
#include "dropdown.h"

#include "styles/style_stickers.h"
#include "boxes/confirmbox.h"
#include "boxes/stickersetbox.h"
#include "inline_bots/inline_bot_result.h"
#include "inline_bots/inline_bot_layout_item.h"
#include "dialogs/dialogs_layout.h"
#include "historywidget.h"
#include "localstorage.h"
#include "lang.h"
#include "mainwindow.h"
#include "apiwrap.h"
#include "mainwidget.h"

Dropdown::Dropdown(QWidget *parent, const style::dropdown &st) : TWidget(parent)
, _st(st)
, _width(_st.width)
, a_opacity(0)
, _a_appearance(animation(this, &Dropdown::step_appearance))
, _shadow(_st.shadow) {
	resetButtons();

	_hideTimer.setSingleShot(true);
	connect(&_hideTimer, SIGNAL(timeout()), this, SLOT(hideStart()));

	if (cPlatform() == dbipMac || cPlatform() == dbipMacOld) {
		connect(App::wnd()->windowHandle(), SIGNAL(activeChanged()), this, SLOT(onWndActiveChanged()));
	}
}

void Dropdown::ignoreShow(bool ignore) {
	_ignore = ignore;
}

void Dropdown::onWndActiveChanged() {
	if (!App::wnd()->windowHandle()->isActive() && !isHidden()) {
		leaveEvent(0);
	}
}

IconedButton *Dropdown::addButton(IconedButton *button) {
	button->setParent(this);

	int32 nw = _st.padding.left() + _st.padding.right() + button->width();
	if (nw > _width) {
		_width = nw;
		for (int32 i = 0, l = _buttons.size(); i < l; ++i) _buttons[i]->resize(_width - _st.padding.left() - _st.padding.right(), _buttons[i]->height());
	} else {
		button->resize(_width - _st.padding.left() - _st.padding.right(), button->height());
	}
	if (!button->isHidden()) {
		if (_height > _st.padding.top() + _st.padding.bottom()) {
			_height += _st.border;
		}
		_height += button->height();
	}
	_buttons.push_back(button);
	connect(button, SIGNAL(stateChanged(int, ButtonStateChangeSource)), this, SLOT(buttonStateChanged(int, ButtonStateChangeSource)));

	resize(_width, _height);

	return button;
}

void Dropdown::resetButtons() {
	_width = qMax(_st.padding.left() + _st.padding.right(), int(_st.width));
	_height = _st.padding.top() + _st.padding.bottom();
	for (int32 i = 0, l = _buttons.size(); i < l; ++i) {
		delete _buttons[i];
	}
	_buttons.clear();
	resize(_width, _height);

	_selected = -1;
}

void Dropdown::updateButtons() {
	int32 top = _st.padding.top(), starttop = top;
	for (Buttons::const_iterator i = _buttons.cbegin(), e = _buttons.cend(); i != e; ++i) {
		if (!(*i)->isHidden()) {
			(*i)->move(_st.padding.left(), top);
			if ((*i)->width() != _width - _st.padding.left() - _st.padding.right()) {
				(*i)->resize(_width - _st.padding.left() - _st.padding.right(), (*i)->height());
			}
			top += (*i)->height() + _st.border;
		}
	}
	_height = top + _st.padding.bottom() - (top > starttop ? _st.border : 0);
	resize(_width, _height);
}

void Dropdown::resizeEvent(QResizeEvent *e) {
	int32 top = _st.padding.top();
	for (Buttons::const_iterator i = _buttons.cbegin(), e = _buttons.cend(); i != e; ++i) {
		if (!(*i)->isHidden()) {
			(*i)->move(_st.padding.left(), top);
			top += (*i)->height() + _st.border;
		}
	}
}

void Dropdown::paintEvent(QPaintEvent *e) {
	QPainter p(this);

	if (_a_appearance.animating()) {
		p.setOpacity(a_opacity.current());
	}

	// draw shadow
	QRect r(_st.padding.left(), _st.padding.top(), _width - _st.padding.left() - _st.padding.right(), _height - _st.padding.top() - _st.padding.bottom());
	_shadow.paint(p, r, _st.shadowShift);

	if (!_buttons.isEmpty() && _st.border > 0) { // paint separators
		p.setPen(_st.borderColor->p);
		int32 top = _st.padding.top(), i = 0, l = _buttons.size();
		for (; i < l; ++i) {
			if (!_buttons.at(i)->isHidden()) break;
		}
		if (i < l) {
			top += _buttons.at(i)->height();
			for (++i; i < l; ++i) {
				if (!_buttons.at(i)->isHidden()) {
					p.fillRect(_st.padding.left(), top, _width - _st.padding.left() - _st.padding.right(), _st.border, _st.borderColor->b);
					top += _st.border + _buttons.at(i)->height();
				}
			}
		}
	}
}

void Dropdown::enterEvent(QEvent *e) {
	_hideTimer.stop();
	if (_hiding) showStart();
	return TWidget::enterEvent(e);
}

void Dropdown::leaveEvent(QEvent *e) {
	if (_a_appearance.animating()) {
		hideStart();
	} else {
		_hideTimer.start(300);
	}
	return TWidget::leaveEvent(e);
}

void Dropdown::keyPressEvent(QKeyEvent *e) {
	if (e->key() == Qt::Key_Enter || e->key() == Qt::Key_Return) {
		if (_selected >= 0 && _selected < _buttons.size()) {
			emit _buttons[_selected]->clicked();
			return;
		}
	} else if (e->key() == Qt::Key_Escape) {
		hideStart();
		return;
	}
	if ((e->key() != Qt::Key_Up && e->key() != Qt::Key_Down) || _buttons.size() < 1) return;

	bool none = (_selected < 0 || _selected >= _buttons.size());
	int32 delta = (e->key() == Qt::Key_Down ? 1 : -1);
	int32 newSelected = none ? (e->key() == Qt::Key_Down ? 0 : _buttons.size() - 1) : (_selected + delta);
	if (newSelected < 0) {
		newSelected = _buttons.size() - 1;
	} else if (newSelected >= _buttons.size()) {
		newSelected = 0;
	}
	int32 startFrom = newSelected;
	while (_buttons.at(newSelected)->isHidden()) {
		newSelected += delta;
		if (newSelected < 0) {
			newSelected = _buttons.size() - 1;
		} else if (newSelected >= _buttons.size()) {
			newSelected = 0;
		}
		if (newSelected == startFrom) return;
	}
	if (!none) {
		_buttons[_selected]->setOver(false);
	}
	_selected = newSelected;
	_buttons[_selected]->setOver(true);
}

void Dropdown::buttonStateChanged(int oldState, ButtonStateChangeSource source) {
	if (source == ButtonByUser) {
		for (int32 i = 0, l = _buttons.size(); i < l; ++i) {
			if (_buttons[i]->getState() & Button::StateOver) {
				if (i != _selected) {
					_buttons[i]->setOver(false);
				}
			}
		}
	} else if (source == ButtonByHover) {
		bool found = false;
		for (int32 i = 0, l = _buttons.size(); i < l; ++i) {
			if (_buttons[i]->getState() & Button::StateOver) {
				found = true;
				if (i != _selected) {
					int32 sel = _selected;
					_selected = i;
					if (sel >= 0 && sel < _buttons.size()) {
						_buttons[sel]->setOver(false);
					}
				}
			}
		}
		if (!found) {
			_selected = -1;
		}
	}
}

void Dropdown::otherEnter() {
	_hideTimer.stop();
	showStart();
}

void Dropdown::otherLeave() {
	if (_a_appearance.animating()) {
		hideStart();
	} else {
		_hideTimer.start(0);
	}
}

void Dropdown::fastHide() {
	if (_a_appearance.animating()) {
		_a_appearance.stop();
	}
	a_opacity = anim::fvalue(0, 0);
	_hideTimer.stop();
	hide();
}

void Dropdown::adjustButtons() {
	for (Buttons::const_iterator i = _buttons.cbegin(), e = _buttons.cend(); i != e; ++i) {
		(*i)->setOpacity(a_opacity.current());
	}
}

void Dropdown::hideStart() {
	_hiding = true;
	a_opacity.start(0);
	_a_appearance.start();
}

void Dropdown::hideFinish() {
	emit hiding();
	hide();
	for (Buttons::const_iterator i = _buttons.cbegin(), e = _buttons.cend(); i != e; ++i) {
		(*i)->clearState();
	}
	_selected = -1;
}

void Dropdown::showStart() {
	if (!isHidden() && a_opacity.current() == 1) {
		return;
	}
	_selected = -1;
	_hiding = false;
	show();
	a_opacity.start(1);
	_a_appearance.start();
}

void Dropdown::step_appearance(float64 ms, bool timer) {
	float64 dt = ms / _st.duration;
	if (dt >= 1) {
		_a_appearance.stop();
		a_opacity.finish();
		if (_hiding) {
			hideFinish();
		}
	} else {
		a_opacity.update(dt, anim::linear);
	}
	adjustButtons();
	if (timer) update();
}

bool Dropdown::eventFilter(QObject *obj, QEvent *e) {
	if (e->type() == QEvent::Enter) {
		otherEnter();
	} else if (e->type() == QEvent::Leave) {
		otherLeave();
	} else if (e->type() == QEvent::MouseButtonPress && static_cast<QMouseEvent*>(e)->button() == Qt::LeftButton) {
		if (isHidden() || _hiding) {
			otherEnter();
		} else {
			otherLeave();
		}
	}
	return false;
}

DragArea::DragArea(QWidget *parent) : TWidget(parent)
, _hiding(false)
, _in(false)
, a_opacity(0)
, a_color(st::dragColor->c)
, _a_appearance(animation(this, &DragArea::step_appearance))
, _shadow(st::boxShadow) {
	setMouseTracking(true);
	setAcceptDrops(true);
}

void DragArea::mouseMoveEvent(QMouseEvent *e) {
	if (_hiding) return;

	bool newIn = QRect(st::dragPadding.left(), st::dragPadding.top(), width() - st::dragPadding.left() - st::dragPadding.right(), height() - st::dragPadding.top() - st::dragPadding.bottom()).contains(e->pos());
	if (newIn != _in) {
		_in = newIn;
		a_opacity.start(1);
		a_color.start((_in ? st::dragDropColor : st::dragColor)->c);
		_a_appearance.start();
	}
}

void DragArea::dragMoveEvent(QDragMoveEvent *e) {
	QRect r(st::dragPadding.left(), st::dragPadding.top(), width() - st::dragPadding.left() - st::dragPadding.right(), height() - st::dragPadding.top() - st::dragPadding.bottom());
	bool newIn = r.contains(e->pos());
	if (newIn != _in) {
		_in = newIn;
		a_opacity.start(1);
		a_color.start((_in ? st::dragDropColor : st::dragColor)->c);
		_a_appearance.start();
	}
	e->setDropAction(_in ? Qt::CopyAction : Qt::IgnoreAction);
	e->accept();
}

void DragArea::setText(const QString &text, const QString &subtext) {
	_text = text;
	_subtext = subtext;
	update();
}

void DragArea::paintEvent(QPaintEvent *e) {
	QPainter p(this);

	if (_a_appearance.animating()) {
		p.setOpacity(a_opacity.current());
	}

	QRect r(st::dragPadding.left(), st::dragPadding.top(), width() - st::dragPadding.left() - st::dragPadding.right(), height() - st::dragPadding.top() - st::dragPadding.bottom());

	// draw shadow
	_shadow.paint(p, r, st::boxShadowShift);

	p.fillRect(r, st::white->b);

	p.setPen(a_color.current());

	p.setFont(st::dragFont->f);
	p.drawText(QRect(0, (height() - st::dragHeight) / 2, width(), st::dragFont->height), _text, QTextOption(style::al_top));

	p.setFont(st::dragSubfont->f);
	p.drawText(QRect(0, (height() + st::dragHeight) / 2 - st::dragSubfont->height, width(), st::dragSubfont->height * 2), _subtext, QTextOption(style::al_top));
}

void DragArea::dragEnterEvent(QDragEnterEvent *e) {
	static_cast<HistoryWidget*>(parentWidget())->dragEnterEvent(e);
	e->setDropAction(Qt::IgnoreAction);
	e->accept();
}

void DragArea::dragLeaveEvent(QDragLeaveEvent *e) {
	static_cast<HistoryWidget*>(parentWidget())->dragLeaveEvent(e);
	_in = false;
	a_opacity.start(_hiding ? 0 : 1);
	a_color.start((_in ? st::dragDropColor : st::dragColor)->c);
	_a_appearance.start();
}

void DragArea::dropEvent(QDropEvent *e) {
	static_cast<HistoryWidget*>(parentWidget())->dropEvent(e);
	if (e->isAccepted()) {
		emit dropped(e->mimeData());
	}
}

void DragArea::otherEnter() {
	showStart();
}

void DragArea::otherLeave() {
	hideStart();
}

void DragArea::fastHide() {
	if (_a_appearance.animating()) {
		_a_appearance.stop();
	}
	a_opacity = anim::fvalue(0, 0);
	hide();
}

void DragArea::hideStart() {
	_hiding = true;
	_in = false;
	a_opacity.start(0);
	a_color.start((_in ? st::dragDropColor : st::dragColor)->c);
	_a_appearance.start();
}

void DragArea::hideFinish() {
	hide();
	_in = false;
	a_color = anim::cvalue(st::dragColor->c);
}

void DragArea::showStart() {
	_hiding = false;
	show();
	a_opacity.start(1);
	a_color.start((_in ? st::dragDropColor : st::dragColor)->c);
	_a_appearance.start();
}

void DragArea::step_appearance(float64 ms, bool timer) {
	float64 dt = ms / st::dropdownDef.duration;
	if (dt >= 1) {
		a_opacity.finish();
		a_color.finish();
		if (_hiding) {
			hideFinish();
		}
		_a_appearance.stop();
	} else {
		a_opacity.update(dt, anim::linear);
		a_color.update(dt, anim::linear);
	}
	if (timer) update();
}