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added pan/zoom for channel post image

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This commit is contained in:
csoler 2020-08-26 22:29:49 +02:00
parent 9e20c04e3f
commit 4472f1cef4
5 changed files with 234 additions and 69 deletions
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4
retroshare-gui/src/gui/gxschannels/CreateGxsChannelMsg.cpp
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@ -688,7 +688,7 @@ void CreateGxsChannelMsg::sendMessage(const std::string &subject, const std::str
// send chan image
buffer.open(QIODevice::WriteOnly);
picture.save(&buffer, "PNG"); // writes image into ba in PNG format
preview_W->getCroppedScaledPicture().save(&buffer, "PNG"); // writes image into ba in PNG format
post.mThumbnail.copy((uint8_t *) ba.data(), ba.size());
}
@ -723,7 +723,7 @@ void CreateGxsChannelMsg::sendMessage(const std::string &subject, const std::str
void CreateGxsChannelMsg::addThumbnail()
{
QPixmap img = misc::getOpenThumbnailedPicture(this, tr("Load thumbnail picture"), 107,156); // these absolute sizes are terrible
QPixmap img = misc::getOpenThumbnailedPicture(this, tr("Load thumbnail picture"), 0,0); // 0,0 means: no scale.
if (img.isNull())
return;

189
retroshare-gui/src/gui/gxschannels/GxsChannelPostThumbnail.cpp Normal file
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@ -0,0 +1,189 @@
/*******************************************************************************
* retroshare-gui/src/gui/gxschannels/GxsChannelPostThumbnail.cpp *
* *
* Copyright 2020 by Retroshare Team <retroshare.project@gmail.com> *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Affero General Public License as *
* published by the Free Software Foundation, either version 3 of the *
* License, or (at your option) any later version. *
* *
* This program 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 Affero General Public License for more details. *
* *
* You should have received a copy of the GNU Affero General Public License *
* along with this program. If not, see <https://www.gnu.org/licenses/>. *
* *
*******************************************************************************/
#include <QWheelEvent>
#include "gui/common/FilesDefs.h"
#include "gui/gxschannels/GxsChannelPostThumbnail.h"
ChannelPostThumbnailView::ChannelPostThumbnailView(const RsGxsChannelPost& post,QWidget *parent)
: QWidget(parent)
{
// now fill the data
QPixmap thumbnail;
if(post.mThumbnail.mSize > 0)
GxsIdDetails::loadPixmapFromData(post.mThumbnail.mData, post.mThumbnail.mSize, thumbnail,GxsIdDetails::ORIGINAL);
else if(post.mMeta.mPublishTs > 0) // this is for testing that the post is not an empty post (happens at the end of the last row)
thumbnail = FilesDefs::getPixmapFromQtResourcePath(CHAN_DEFAULT_IMAGE);
init(thumbnail, QString::fromUtf8(post.mMeta.mMsgName.c_str()), IS_MSG_UNREAD(post.mMeta.mMsgStatus) || IS_MSG_NEW(post.mMeta.mMsgStatus) );
}
ChannelPostThumbnailView::ChannelPostThumbnailView(QWidget *parent)
: QWidget(parent)
{
init(FilesDefs::getPixmapFromQtResourcePath(CHAN_DEFAULT_IMAGE), QString("New post"),false);
}
ChannelPostThumbnailView::~ChannelPostThumbnailView()
{
delete lb;
delete lt;
}
void ChannelPostThumbnailView::init(const QPixmap& thumbnail,const QString& msg,bool is_msg_new)
{
QVBoxLayout *layout = new QVBoxLayout(this);
lb = new ZoomableLabel(this);
lb->setScaledContents(true);
lb->setToolTip(tr("Use mouse to center and zoom into the image"));
layout->addWidget(lb);
lt = new QLabel(this);
layout->addWidget(lt);
setLayout(layout);
setSizePolicy(QSizePolicy::Maximum,QSizePolicy::Maximum);
QFontMetricsF fm(font());
int W = THUMBNAIL_OVERSAMPLE_FACTOR * THUMBNAIL_W * fm.height() ;
int H = THUMBNAIL_OVERSAMPLE_FACTOR * THUMBNAIL_H * fm.height() ;
lb->setFixedSize(W,H);
lb->setPicture(thumbnail);
setText(msg);
QFont font = lt->font();
if(is_msg_new)
{
font.setBold(true);
lt->setFont(font);
}
lt->setMaximumWidth(W);
lt->setWordWrap(true);
adjustSize();
update();
}
void ZoomableLabel::mouseMoveEvent(QMouseEvent *me)
{
float new_center_x = mCenterX - (me->x() - mLastX);
float new_center_y = mCenterY - (me->y() - mLastY);
mLastX = me->x();
mLastY = me->y();
if(new_center_x - 0.5 * width()*mZoomFactor < 0) return;
if(new_center_y - 0.5 *height()*mZoomFactor < 0) return;
if(new_center_x + 0.5 * width()*mZoomFactor >= mFullImage.width()) return;
if(new_center_y + 0.5 *height()*mZoomFactor >=mFullImage.height()) return;
mCenterX = new_center_x;
mCenterY = new_center_y;
updateView();
}
void ZoomableLabel::mousePressEvent(QMouseEvent *me)
{
mMoving = true;
mLastX = me->x();
mLastY = me->y();
}
void ZoomableLabel::mouseReleaseEvent(QMouseEvent *)
{
mMoving = false;
}
void ZoomableLabel::wheelEvent(QWheelEvent *me)
{
float new_zoom_factor = (me->delta() > 0)?(mZoomFactor*1.05):(mZoomFactor/1.05);
float new_center_x = mCenterX;
float new_center_y = mCenterY;
// Try to find centerX and centerY so that the crop does not overlap the original image
float min_x = 0.5 * width()*new_zoom_factor;
float max_x = mFullImage.width() - 0.5 * width()*new_zoom_factor;
float min_y = 0.5 * height()*new_zoom_factor;
float max_y = mFullImage.height() - 0.5 * height()*new_zoom_factor;
if(min_x >= max_x) return;
if(min_y >= max_y) return;
if(new_center_x < min_x) new_center_x = min_x;
if(new_center_y < min_y) new_center_y = min_y;
if(new_center_x > max_x) new_center_x = max_x;
if(new_center_y > max_y) new_center_y = max_y;
mZoomFactor = new_zoom_factor;
mCenterX = new_center_x;
mCenterY = new_center_y;
updateView();
}
QPixmap ZoomableLabel::extractCroppedScaledPicture() const
{
QRect rect(mCenterX - 0.5 * width()*mZoomFactor, mCenterY - 0.5 * height()*mZoomFactor, width()*mZoomFactor, height()*mZoomFactor);
QPixmap pix = mFullImage.copy(rect).scaledToHeight(height(),Qt::SmoothTransformation);
return pix;
}
void ZoomableLabel::setPicture(const QPixmap& pix)
{
mFullImage = pix;
mCenterX = pix.width()/2.0;
mCenterY = pix.height()/2.0;
updateView();
}
void ZoomableLabel::resizeEvent(QResizeEvent *e)
{
QLabel::resizeEvent(e);
updateView();
}
void ZoomableLabel::updateView()
{
// The new image will be cropped from the original image, using the following rules:
// - first the cropped image size is computed
// - then center is calculated so that
// - the original center is preferred
// - if the crop overlaps the image border, the center is moved.
QRect rect(mCenterX - 0.5 * width()*mZoomFactor, mCenterY - 0.5 * height()*mZoomFactor, width()*mZoomFactor, height()*mZoomFactor);
QLabel::setPixmap(mFullImage.copy(rect));
}

101
retroshare-gui/src/gui/gxschannels/GxsChannelPostThumbnail.h
View File

@ -32,6 +32,35 @@
#include "gui/gxs/GxsIdDetails.h"
#include "gui/common/FilesDefs.h"
// Class to provide a label in which the image can be zoomed/moved. The widget size is fixed by the GUI and the user can move/zoom the image
// inside the window formed by the widget. When happy, the view-able part of the image can be extracted.
class ZoomableLabel: public QLabel
{
public:
ZoomableLabel(QWidget *parent): QLabel(parent),mZoomFactor(1.0),mCenterX(0.0),mCenterY(0.0) {}
void setPicture(const QPixmap& pix);
QPixmap extractCroppedScaledPicture() const;
protected:
void mousePressEvent(QMouseEvent *ev) override;
void mouseReleaseEvent(QMouseEvent *ev) override;
void mouseMoveEvent(QMouseEvent *ev) override;
void resizeEvent(QResizeEvent *ev) override;
void wheelEvent(QWheelEvent *me) override;
void updateView();
QPixmap mFullImage;
float mCenterX;
float mCenterY;
float mZoomFactor;
int mLastX,mLastY;
bool mMoving;
};
// Class to paint the thumbnails with title
class ChannelPostThumbnailView: public QWidget
@ -49,73 +78,15 @@ public:
static constexpr char *CHAN_DEFAULT_IMAGE = ":images/thumb-default-video.png";
virtual ~ChannelPostThumbnailView()
{
delete lb;
delete lt;
}
virtual ~ChannelPostThumbnailView();
ChannelPostThumbnailView(QWidget *parent=NULL);
ChannelPostThumbnailView(const RsGxsChannelPost& post,QWidget *parent=NULL);
ChannelPostThumbnailView(QWidget *parent=NULL): QWidget(parent)
{
init(FilesDefs::getPixmapFromQtResourcePath(CHAN_DEFAULT_IMAGE), QString("New post"),false);
}
void init(const QPixmap& thumbnail,const QString& msg,bool is_msg_new);
ChannelPostThumbnailView(const RsGxsChannelPost& post,QWidget *parent=NULL)
: QWidget(parent)
{
// now fill the data
void setPixmap(const QPixmap& p) { lb->setPicture(p); }
QPixmap getCroppedScaledPicture() const { return lb->extractCroppedScaledPicture() ; }
QPixmap thumbnail;
if(post.mThumbnail.mSize > 0)
GxsIdDetails::loadPixmapFromData(post.mThumbnail.mData, post.mThumbnail.mSize, thumbnail,GxsIdDetails::ORIGINAL);
else if(post.mMeta.mPublishTs > 0) // this is for testing that the post is not an empty post (happens at the end of the last row)
thumbnail = FilesDefs::getPixmapFromQtResourcePath(CHAN_DEFAULT_IMAGE);
init(thumbnail, QString::fromUtf8(post.mMeta.mMsgName.c_str()), IS_MSG_UNREAD(post.mMeta.mMsgStatus) || IS_MSG_NEW(post.mMeta.mMsgStatus) );
}
void init(const QPixmap& thumbnail,const QString& msg,bool is_msg_new)
{
QVBoxLayout *layout = new QVBoxLayout(this);
lb = new QLabel(this);
lb->setScaledContents(true);
layout->addWidget(lb);
lt = new QLabel(this);
layout->addWidget(lt);
setLayout(layout);
setSizePolicy(QSizePolicy::Maximum,QSizePolicy::Maximum);
QFontMetricsF fm(font());
int W = THUMBNAIL_OVERSAMPLE_FACTOR * THUMBNAIL_W * fm.height() ;
int H = THUMBNAIL_OVERSAMPLE_FACTOR * THUMBNAIL_H * fm.height() ;
lb->setFixedSize(W,H);
lb->setPixmap(thumbnail);
setText(msg);
QFont font = lt->font();
if(is_msg_new)
{
font.setBold(true);
lt->setFont(font);
}
lt->setMaximumWidth(W);
lt->setWordWrap(true);
adjustSize();
update();
}
void setPixmap(const QPixmap& p) { lb->setPixmap(p); }
void setText(const QString& s)
{
QString ss;
@ -128,7 +99,7 @@ public:
}
private:
QLabel *lb;
ZoomableLabel *lb;
QLabel *lt;
};

1
retroshare-gui/src/retroshare-gui.pro
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@ -1382,6 +1382,7 @@ gxschannels {
gui/gxschannels/GxsChannelPostsModel.cpp \
gui/gxschannels/GxsChannelPostFilesModel.cpp \
gui/gxschannels/GxsChannelFilesWidget.cpp \
gui/gxschannels/GxsChannelPostThumbnail.cpp \
gui/gxschannels/GxsChannelFilesStatusWidget.cpp \
gui/gxschannels/GxsChannelGroupDialog.cpp \
gui/gxschannels/CreateGxsChannelMsg.cpp \

4
retroshare-gui/src/util/misc.cpp
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@ -307,7 +307,11 @@ QPixmap misc::getOpenThumbnailedPicture(QWidget *parent, const QString &caption,
if (!getOpenFileName(parent, RshareSettings::LASTDIR_IMAGES, caption, tr("Pictures (*.png *.jpeg *.xpm *.jpg *.tiff *.gif)"), fileName))
return QPixmap();
if(width > 0 && height > 0)
return QPixmap(fileName).scaledToHeight(height, Qt::SmoothTransformation).copy( 0, 0, width, height);
else
return QPixmap(fileName);
//return QPixmap(fileName).scaledToHeight(width, height, Qt::KeepAspectRatioByExpanding, Qt::SmoothTransformation);
}