tdesktop/Telegram/SourceFiles/history/history_media.h

/*
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) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once

enum class MediaInBubbleState {
	None,
	Top,
	Middle,
	Bottom,
};

class HistoryMedia : public HistoryElement {
public:
	HistoryMedia(gsl::not_null<HistoryItem*> parent) : _parent(parent) {
	}

	virtual HistoryMediaType type() const = 0;

	virtual QString notificationText() const {
		return QString();
	}

	// Returns text with link-start and link-end commands for service-color highlighting.
	// Example: "[link1-start]You:[link1-end] [link1-start]Photo,[link1-end] caption text"
	virtual QString inDialogsText() const {
		auto result = notificationText();
		return result.isEmpty() ? QString() : textcmdLink(1, TextUtilities::Clean(result));
	}
	virtual TextWithEntities selectedText(TextSelection selection) const = 0;

	bool hasPoint(QPoint point) const {
		return QRect(0, 0, _width, _height).contains(point);
	}

	virtual bool isDisplayed() const {
		return true;
	}
	virtual bool isAboveMessage() const {
		return false;
	}
	virtual bool hasTextForCopy() const {
		return false;
	}
	virtual bool allowsFastShare() const {
		return false;
	}
	virtual void initDimensions() = 0;
	virtual void updateMessageId() {
	}
	virtual int resizeGetHeight(int width) {
		_width = qMin(width, _maxw);
		return _height;
	}
	virtual void draw(Painter &p, const QRect &r, TextSelection selection, TimeMs ms) const = 0;
	virtual HistoryTextState getState(QPoint point, HistoryStateRequest request) const = 0;
	virtual void updatePressed(QPoint point) {
	}

	virtual int32 addToOverview(AddToOverviewMethod method) {
		return 0;
	}
	virtual void eraseFromOverview() {
	}

	// if we are in selecting items mode perhaps we want to
	// toggle selection instead of activating the pressed link
	virtual bool toggleSelectionByHandlerClick(const ClickHandlerPtr &p) const = 0;

	// if we press and drag on this media should we drag the item
	virtual bool dragItem() const WARN_UNUSED_RESULT {
		return false;
	}

	virtual TextSelection adjustSelection(TextSelection selection, TextSelectType type) const WARN_UNUSED_RESULT {
		return selection;
	}
	virtual bool consumeMessageText(const TextWithEntities &textWithEntities) WARN_UNUSED_RESULT {
		return false;
	}
	virtual uint16 fullSelectionLength() const WARN_UNUSED_RESULT {
		return 0;
	}
	TextSelection skipSelection(TextSelection selection) const WARN_UNUSED_RESULT {
		return internal::unshiftSelection(selection, fullSelectionLength());
	}
	TextSelection unskipSelection(TextSelection selection) const WARN_UNUSED_RESULT {
		return internal::shiftSelection(selection, fullSelectionLength());
	}

	// if we press and drag this link should we drag the item
	virtual bool dragItemByHandler(const ClickHandlerPtr &p) const = 0;

	virtual void clickHandlerActiveChanged(const ClickHandlerPtr &p, bool active) {
	}
	virtual void clickHandlerPressedChanged(const ClickHandlerPtr &p, bool pressed) {
	}

	virtual bool uploading() const {
		return false;
	}
	virtual std::unique_ptr<HistoryMedia> clone(HistoryItem *newParent) const = 0;

	virtual DocumentData *getDocument() {
		return nullptr;
	}
	virtual Media::Clip::Reader *getClipReader() {
		return nullptr;
	}

	bool playInline(/*bool autoplay = false*/) {
		return playInline(false);
	}
	virtual bool playInline(bool autoplay) {
		return false;
	}
	virtual void stopInline() {
	}
	virtual bool isRoundVideoPlaying() const {
		return false;
	}

	virtual void attachToParent() {
	}

	virtual void detachFromParent() {
	}

	virtual void updateSentMedia(const MTPMessageMedia &media) {
	}

	// After sending an inline result we may want to completely recreate
	// the media (all media that was generated on client side, for example)
	virtual bool needReSetInlineResultMedia(const MTPMessageMedia &media) {
		return true;
	}

	virtual bool animating() const {
		return false;
	}

	virtual bool hasReplyPreview() const {
		return false;
	}
	virtual ImagePtr replyPreview() {
		return ImagePtr();
	}
	virtual TextWithEntities getCaption() const {
		return TextWithEntities();
	}
	virtual bool needsBubble() const = 0;
	virtual bool customInfoLayout() const = 0;
	virtual QMargins bubbleMargins() const {
		return QMargins();
	}
	virtual bool hideForwardedFrom() const {
		return false;
	}

	// An attach media in a web page can provide an
	// additional text to be displayed below the attach.
	// For example duration / progress for video messages.
	virtual QString additionalInfoString() const {
		return QString();
	}

	int currentWidth() const {
		return _width;
	}

	void setInBubbleState(MediaInBubbleState state) {
		_inBubbleState = state;
	}
	MediaInBubbleState inBubbleState() const {
		return _inBubbleState;
	}
	bool isBubbleTop() const {
		return (_inBubbleState == MediaInBubbleState::Top) || (_inBubbleState == MediaInBubbleState::None);
	}
	bool isBubbleBottom() const {
		return (_inBubbleState == MediaInBubbleState::Bottom) || (_inBubbleState == MediaInBubbleState::None);
	}
	virtual bool skipBubbleTail() const {
		return false;
	}

	virtual bool canEditCaption() const {
		return false;
	}

	// Sometimes click on media in message is overloaded by the messsage:
	// (for example it can open a link or a game instead of opening media)
	// But the overloading click handler should be used only when media
	// is already loaded (not a photo or gif waiting for load with auto
	// load being disabled - in such case media should handle the click).
	virtual bool isReadyForOpen() const {
		return true;
	}

protected:
	int32 addToOneOverview(MediaOverviewType type, AddToOverviewMethod method) {
		if (_parent->history()->addToOverview(type, _parent->id, method)) {
			return (1 << type);
		}
		return 0;
	}
	void eraseFromOneOverview(MediaOverviewType type) {
		_parent->history()->eraseFromOverview(type, _parent->id);
	}

	gsl::not_null<HistoryItem*> _parent;
	int _width = 0;
	MediaInBubbleState _inBubbleState = MediaInBubbleState::None;


};