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03122a24db
1. De-duplicate the images occur multiple times in the note; 2. Refresh the read mode and edit mode preview after the directory path change; 3. Update init images and inserted images after the directory path change;
154 lines
4.1 KiB
C++
154 lines
4.1 KiB
C++
#ifndef VPREVIEWMANAGER_H
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#define VPREVIEWMANAGER_H
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#include <QObject>
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#include <QString>
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#include <QTextBlock>
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#include <QHash>
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#include <QVector>
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#include "hgmarkdownhighlighter.h"
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#include "vmdeditor.h"
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#include "vtextblockdata.h"
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class VDownloader;
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typedef long long TS;
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class VPreviewManager : public QObject
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{
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Q_OBJECT
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public:
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VPreviewManager(VMdEditor *p_editor, HGMarkdownHighlighter *p_highlighter);
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void setPreviewEnabled(bool p_enabled);
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// Clear all the preview.
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void clearPreview();
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// Refresh all the preview.
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void refreshPreview();
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public slots:
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// Image links were updated from the highlighter.
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void imageLinksUpdated(const QVector<VElementRegion> &p_imageRegions);
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signals:
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// Request highlighter to update image links.
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void requestUpdateImageLinks();
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private slots:
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// Non-local image downloaded for preview.
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void imageDownloaded(const QByteArray &p_data, const QString &p_url);
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private:
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struct ImageLinkInfo
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{
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ImageLinkInfo()
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: m_startPos(-1),
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m_endPos(-1),
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m_blockPos(-1),
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m_blockNumber(-1),
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m_padding(0),
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m_isBlock(false)
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{
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}
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ImageLinkInfo(int p_startPos,
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int p_endPos,
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int p_blockPos,
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int p_blockNumber,
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int p_padding)
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: m_startPos(p_startPos),
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m_endPos(p_endPos),
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m_blockPos(p_blockPos),
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m_blockNumber(p_blockNumber),
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m_padding(p_padding),
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m_isBlock(false)
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{
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}
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int m_startPos;
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int m_endPos;
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// Position of this block.
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int m_blockPos;
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int m_blockNumber;
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// Left padding of this block in pixels.
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int m_padding;
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// Short URL within the () of ![]().
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// Used as the ID of the image.
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QString m_linkShortUrl;
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// Full URL of the link.
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QString m_linkUrl;
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// Whether it is an image block.
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bool m_isBlock;
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};
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// Start to preview images according to image links.
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void previewImages(TS p_timeStamp);
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// According to m_imageRegions, fetch the image link Url.
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// @p_imageRegions: output.
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void fetchImageLinksFromRegions(QVector<ImageLinkInfo> &p_imageLinks);
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// Fetch the image link's URL if there is only one link.
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QString fetchImageUrlToPreview(const QString &p_text);
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// Fetch teh image's full path if there is only one image link.
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// @p_url: contains the short URL in ![]().
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QString fetchImagePathToPreview(const QString &p_text, QString &p_url);
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// Update the preview info of related blocks according to @p_imageLinks.
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void updateBlockPreviewInfo(TS p_timeStamp, const QVector<ImageLinkInfo> &p_imageLinks);
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// Get the name of the image in the resource manager.
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// Will add the image to the resource manager if not exists.
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// Returns empty if fail to add the image to the resource manager.
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QString imageResourceName(const ImageLinkInfo &p_link);
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// Calculate the block margin (prefix spaces) in pixels.
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int calculateBlockMargin(const QTextBlock &p_block);
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QHash<QString, long long> &imageCache(PreviewSource p_source);
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void clearObsoleteImages(long long p_timeStamp, PreviewSource p_source);
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void clearBlockObsoletePreviewInfo(long long p_timeStamp, PreviewSource p_source);
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VMdEditor *m_editor;
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QTextDocument *m_document;
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HGMarkdownHighlighter *m_highlighter;
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VDownloader *m_downloader;
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// Whether preview is enabled.
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bool m_previewEnabled;
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// Regions of all the image links.
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QVector<VElementRegion> m_imageRegions;
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// Map from URL to name in the resource manager.
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// Used for downloading images.
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QHash<QString, QString> m_urlToName;
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TS m_timeStamp;
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// Used to discard obsolete images. One per each preview source.
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QHash<QString, long long> m_imageCaches[(int)PreviewSource::MaxNumberOfSources];
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};
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inline QHash<QString, long long> &VPreviewManager::imageCache(PreviewSource p_source)
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{
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return m_imageCaches[(int)p_source];
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}
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#endif // VPREVIEWMANAGER_H
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