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support specifying image size in preview

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This commit is contained in:
Le Tan 2018-05-06 21:36:22 +08:00
parent 84437bcd97
commit dba154b2c3
6 changed files with 121 additions and 35 deletions
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13
src/resources/docs/markdown_guide_en.md
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@ -73,7 +73,15 @@ Notice that the sequence number is irrelevant. Markdown will change the sequence
### Images and Links
```md
![Image Alt Text](/url/to/images.png)
![Image Alt Text](/url/to/image.png "Optional Text")
![Image Alt Text](/url/to/image.png "Image specified with width and height" =800x600)
![Image Alt Text](/url/to/image.png =800x600)
![Image Alt Text](/url/to/image.png "Image specified with width" =800x)
![Image Alt Text](/url/to/image.png "Image specified with height" =x600)
[Link Text](/url/of/the/link)
```
@ -81,6 +89,7 @@ Notice that the sequence number is irrelevant. Markdown will change the sequence
**Notes**:
- It is not recommended to use image links in reference format. VNote will not preview those images.
- Specifying size of image is supported only in **markdown-it**.
### Blockquotes
```md
@ -164,6 +173,8 @@ VNote also supports displayed mathematics via fenced code block with language `m
Here is a `inline code`.
```
To insert one `` ` ``, you need to use two `` ` `` to enclose it, such as ``` `` ` `` ```. To insert two `` ` ``, you need to use three `` ` ``.
### Strikethrough
```md
Here is a ~~text~~ with strikethrough.

13
src/resources/docs/markdown_guide_zh.md
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@ -74,7 +74,15 @@ __This text will be bold__
### 图片和链接
```md
![Image Alt Text](/url/to/images.png)
![Image Alt Text](/url/to/image.png "Optional Text")
![Image Alt Text](/url/to/image.png "Image specified with width and height" =800x600)
![Image Alt Text](/url/to/image.png =800x600)
![Image Alt Text](/url/to/image.png "Image specified with width" =800x)
![Image Alt Text](/url/to/image.png "Image specified with height" =x600)
[Link Text](/url/of/the/link)
```
@ -82,6 +90,7 @@ __This text will be bold__
**注意**：
- VNote不推荐使用参考式的图片链接。VNote不会预览这些图片。
- 声明图片尺寸只在 **markdown-it** 中支持。
### 块引用
```md
@ -165,6 +174,8 @@ VNote也可以使用标明语言`mathjax`的代码块来实现块公式。使用
Here is a `inline code`.
```
如果想输入一个 `` ` ``，需要使用两个 `` ` `` 来括住它，例如 ``` `` ` `` ```。 要输入两个 `` ` ``，则需要使用三个 `` ` ``。
### 删除线
```md
Here is a ~~text~~ with strikethrough.

5
src/utils/vutils.cpp
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@ -37,7 +37,10 @@ extern VConfigManager *g_config;
QVector<QPair<QString, QString>> VUtils::s_availableLanguages;
const QString VUtils::c_imageLinkRegExp = QString("\\!\\[([^\\]]*)\\]\\(([^\\)\"]+)\\s*(\"(\\\\.|[^\"\\)])*\")?\\s*\\)");
const QString VUtils::c_imageLinkRegExp = QString("\\!\\[([^\\]]*)\\]\\(([^\\)\"'\\s]+)\\s*"
"((\"[^\"\\)\\n]*\")|('[^'\\)\\n]*'))?\\s*"
"(=(\\d*)x(\\d*))?\\s*"
"\\)");
const QString VUtils::c_imageTitleRegExp = QString("[\\w\\(\\)@#%\\*\\-\\+=\\?<>\\,\\.\\s]*");

8
src/utils/vutils.h
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@ -328,12 +328,16 @@ public:
static QPixmap pixmapFromFile(const QString &p_filePath);
// Regular expression for image link.
// ![image title]( http://github.com/tamlok/vnote.jpg "alt \" text" )
// ![image title]( http://github.com/tamlok/vnote.jpg "alt text" =200x100)
// Captured texts (need to be trimmed):
// 1. Image Alt Text (Title);
// 2. Image URL;
// 3. Image Optional Title with double quotes;
// 3. Image Optional Title with double quotes or quotes;
// 4. Unused;
// 5. Unused;
// 6. Unused;
// 7. Width;
// 8. Height;
static const QString c_imageLinkRegExp;
// Regular expression for image title.

80
src/vpreviewmanager.cpp
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@ -158,31 +158,31 @@ void VPreviewManager::fetchImageLinksFromRegions(QVector<VElementRegion> p_image
|| isAllSpaces(text, reg.m_endPos - blockStart, blockEnd - blockStart))) {
// Image block.
info.m_isBlock = true;
info.m_linkUrl = fetchImagePathToPreview(text, info.m_linkShortUrl);
fetchImageInfoToPreview(text, info);
} else {
// Inline image.
info.m_isBlock = false;
info.m_linkUrl = fetchImagePathToPreview(text.mid(reg.m_startPos - blockStart,
reg.m_endPos - reg.m_startPos),
info.m_linkShortUrl);
fetchImageInfoToPreview(text.mid(reg.m_startPos - blockStart,
reg.m_endPos - reg.m_startPos),
info);
}
if (info.m_linkUrl.isEmpty()) {
if (info.m_linkUrl.isEmpty() || info.m_linkShortUrl.isEmpty()) {
continue;
}
p_imageLinks.append(info);
qDebug() << "image region" << i
<< info.m_startPos << info.m_endPos << info.m_blockNumber
<< info.m_linkShortUrl << info.m_linkUrl << info.m_isBlock;
qDebug() << "image region" << i << info.toString();
}
}
QString VPreviewManager::fetchImageUrlToPreview(const QString &p_text)
QString VPreviewManager::fetchImageUrlToPreview(const QString &p_text, int &p_width, int &p_height)
{
QRegExp regExp(VUtils::c_imageLinkRegExp);
p_width = p_height = -1;
int index = regExp.indexIn(p_text);
if (index == -1) {
return QString();
@ -193,30 +193,48 @@ QString VPreviewManager::fetchImageUrlToPreview(const QString &p_text)
return QString();
}
return regExp.capturedTexts()[2].trimmed();
QString tmp(regExp.cap(7));
if (!tmp.isEmpty()) {
p_width = tmp.toInt();
if (p_width <= 0) {
p_width = -1;
}
}
tmp = regExp.cap(8);
if (!tmp.isEmpty()) {
p_height = tmp.toInt();
if (p_height <= 0) {
p_height = -1;
}
}
return regExp.cap(2).trimmed();
}
QString VPreviewManager::fetchImagePathToPreview(const QString &p_text, QString &p_url)
void VPreviewManager::fetchImageInfoToPreview(const QString &p_text, ImageLinkInfo &p_info)
{
p_url = fetchImageUrlToPreview(p_text);
if (p_url.isEmpty()) {
return p_url;
QString surl = fetchImageUrlToPreview(p_text, p_info.m_width, p_info.m_height);
p_info.m_linkShortUrl = surl;
if (surl.isEmpty()) {
p_info.m_linkUrl = surl;
return;
}
const VFile *file = m_editor->getFile();
QString imagePath;
QFileInfo info(file->fetchBasePath(), p_url);
QFileInfo info(file->fetchBasePath(), surl);
if (info.exists()) {
if (info.isNativePath()) {
// Local file.
imagePath = QDir::cleanPath(info.absoluteFilePath());
} else {
imagePath = p_url;
imagePath = surl;
}
} else {
QString decodedUrl(p_url);
QString decodedUrl(surl);
VUtils::decodeUrl(decodedUrl);
QFileInfo dinfo(file->fetchBasePath(), decodedUrl);
if (dinfo.exists()) {
@ -224,10 +242,10 @@ QString VPreviewManager::fetchImagePathToPreview(const QString &p_text, QString
// Local file.
imagePath = QDir::cleanPath(dinfo.absoluteFilePath());
} else {
imagePath = p_url;
imagePath = surl;
}
} else {
QUrl url(p_url);
QUrl url(surl);
if (url.isLocalFile()) {
imagePath = url.toLocalFile();
} else {
@ -236,14 +254,16 @@ QString VPreviewManager::fetchImagePathToPreview(const QString &p_text, QString
}
}
return imagePath;
p_info.m_linkUrl = imagePath;
}
QString VPreviewManager::imageResourceName(const ImageLinkInfo &p_link)
{
QString name = p_link.m_linkShortUrl;
if (m_editor->containsImage(name)
|| name.isEmpty()) {
// Add size info to the name.
QString name = QString("%1_%2_%3").arg(p_link.m_linkShortUrl)
.arg(p_link.m_width)
.arg(p_link.m_height);
if (m_editor->containsImage(name)) {
return name;
}
@ -263,7 +283,19 @@ QString VPreviewManager::imageResourceName(const ImageLinkInfo &p_link)
return QString();
}
m_editor->addImage(name, image);
// Resize the image.
if (p_link.m_width > 0) {
if (p_link.m_height > 0) {
m_editor->addImage(name, image.scaled(p_link.m_width, p_link.m_height));
} else {
m_editor->addImage(name, image.scaledToWidth(p_link.m_width));
}
} else if (p_link.m_height > 0) {
m_editor->addImage(name, image.scaledToHeight(p_link.m_height));
} else {
m_editor->addImage(name, image);
}
return name;
}

37
src/vpreviewmanager.h
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@ -101,7 +101,9 @@ private:
m_blockPos(-1),
m_blockNumber(-1),
m_padding(0),
m_isBlock(false)
m_isBlock(false),
m_width(-1),
m_height(-1)
{
}
@ -115,10 +117,28 @@ private:
m_blockPos(p_blockPos),
m_blockNumber(p_blockNumber),
m_padding(p_padding),
m_isBlock(false)
m_isBlock(false),
m_width(-1),
m_height(-1)
{
}
QString toString() const
{
return QString("ImageLinkInfo [%1,%2) block(%3,%4) padding %5 "
"short %6 url %7 isBlock %8 width %9 height %10")
.arg(m_startPos)
.arg(m_endPos)
.arg(m_blockNumber)
.arg(m_blockPos)
.arg(m_padding)
.arg(m_linkShortUrl)
.arg(m_linkUrl)
.arg(m_isBlock)
.arg(m_width)
.arg(m_height);
}
int m_startPos;
int m_endPos;
@ -140,6 +160,12 @@ private:
// Whether it is an image block.
bool m_isBlock;
// Image width, -1 for not specified.
int m_width;
// Image height, -1 for not specified.
int m_height;
};
// Start to preview images according to image links.
@ -151,11 +177,10 @@ private:
QVector<ImageLinkInfo> &p_imageLinks);
// Fetch the image link's URL if there is only one link.
QString fetchImageUrlToPreview(const QString &p_text);
QString fetchImageUrlToPreview(const QString &p_text, int &p_width, int &p_height);
// Fetch teh image's full path if there is only one image link.
// @p_url: contains the short URL in ![]().
QString fetchImagePathToPreview(const QString &p_text, QString &p_url);
// Fetch the image's full path and size.
void fetchImageInfoToPreview(const QString &p_text, ImageLinkInfo &p_info);
// Update the preview info of related blocks according to @p_imageLinks.
void updateBlockPreviewInfo(TS p_timeStamp, const QVector<ImageLinkInfo> &p_imageLinks);