feat(paste): Implement pasting images from clipboard

Fixes #1290

src/widget/form/chatform.cpp

@@ -178,6 +178,7 @@ ChatForm::ChatForm(Friend* chatFriend)
 
     connect(msgEdit, &ChatTextEdit::enterPressed, this, &ChatForm::onSendTriggered);
     connect(msgEdit, &ChatTextEdit::textChanged, this, &ChatForm::onTextEditChanged);
+    connect(msgEdit, &ChatTextEdit::pasteImage, this, &ChatForm::sendImage);
     connect(statusMessageLabel, &CroppingLabel::customContextMenuRequested, this,
             [&](const QPoint& pos) {
                 if (!statusMessageLabel->text().isEmpty()) {
@@ -783,19 +784,19 @@ void ChatForm::doScreenshot()
 {
     // note: grabber is self-managed and will destroy itself when done
     ScreenshotGrabber* grabber = new ScreenshotGrabber;
-    connect(grabber, &ScreenshotGrabber::screenshotTaken, this, &ChatForm::onScreenshotTaken);
+    connect(grabber, &ScreenshotGrabber::screenshotTaken, this, &ChatForm::sendImage);
     grabber->showGrabber();
-    // Create dir for screenshots
-    QDir(Settings::getInstance().getAppDataDirPath()).mkpath("screenshots");
 }
 
-void ChatForm::onScreenshotTaken(const QPixmap& pixmap)
+void ChatForm::sendImage(const QPixmap& pixmap)
 {
+    QDir(Settings::getInstance().getAppDataDirPath()).mkpath("images");
+
     // use ~ISO 8601 for screenshot timestamp, considering FS limitations
     // https://en.wikipedia.org/wiki/ISO_8601
     // Windows has to be supported, thus filename can't have `:` in it :/
     // Format should be: `qTox_Screenshot_yyyy-MM-dd HH-mm-ss.zzz.png`
-    QString filepath = QString("%1screenshots%2qTox_Screenshot_%3.png")
+    QString filepath = QString("%1images%2qTox_Image_%3.png")
                            .arg(Settings::getInstance().getAppDataDirPath())
                            .arg(QDir::separator())
                            .arg(QDateTime::currentDateTime().toString("yyyy-MM-dd HH-mm-ss.zzz"));

src/widget/form/chatform.h

@@ -97,7 +97,7 @@ private slots:
     void onLoadHistory();
     void onUpdateTime();
     void onScreenshotClicked();
-    void onScreenshotTaken(const QPixmap& pixmap);
+    void sendImage(const QPixmap& pixmap);
     void doScreenshot();
     void onCopyStatusMessage();
     void onExportChat();

src/widget/tool/chattextedit.cpp

@@ -18,8 +18,13 @@
 */
 
 #include "chattextedit.h"
+
 #include "src/widget/translator.h"
+
+#include <QApplication>
+#include <QClipboard>
 #include <QKeyEvent>
+#include <QMimeData>
 
 ChatTextEdit::ChatTextEdit(QWidget* parent)
     : QTextEdit(parent)
@@ -39,23 +44,30 @@ ChatTextEdit::~ChatTextEdit()
 void ChatTextEdit::keyPressEvent(QKeyEvent* event)
 {
     int key = event->key();
-    if ((key == Qt::Key_Enter || key == Qt::Key_Return) && !(event->modifiers() & Qt::ShiftModifier))
+    if ((key == Qt::Key_Enter || key == Qt::Key_Return) && !(event->modifiers() & Qt::ShiftModifier)) {
         emit enterPressed();
-    else if (key == Qt::Key_Tab) {
+        return;
+    }
+    if (key == Qt::Key_Tab) {
         if (event->modifiers())
             event->ignore();
         else {
             emit tabPressed();
             event->ignore();
         }
-    } else if (key == Qt::Key_Up && this->toPlainText().isEmpty()) {
+        return;
+    }
+    if (key == Qt::Key_Up && this->toPlainText().isEmpty()) {
         this->setText(lastMessage);
         this->setFocus();
         this->moveCursor(QTextCursor::MoveOperation::End, QTextCursor::MoveMode::MoveAnchor);
-    } else {
-        emit keyPressed();
-        QTextEdit::keyPressEvent(event);
+        return;
     }
+    if (event->matches(QKeySequence::Paste) && pasteIfImage(event)) {
+        return;
+    }
+    emit keyPressed();
+    QTextEdit::keyPressEvent(event);
 }
 
 void ChatTextEdit::setLastMessage(QString lm)
@@ -72,3 +84,25 @@ void ChatTextEdit::sendKeyEvent(QKeyEvent* event)
 {
     emit keyPressEvent(event);
 }
+
+bool ChatTextEdit::pasteIfImage(QKeyEvent* event)
+{
+    const QClipboard* const clipboard = QApplication::clipboard();
+    if (!clipboard) {
+        return false;
+    }
+
+    const QMimeData* const mimeData = clipboard->mimeData();
+    if (!mimeData || !mimeData->hasImage()) {
+        return false;
+    }
+
+    const QPixmap pixmap(clipboard->pixmap());
+    if (pixmap.isNull()) {
+        return false;
+    }
+
+    emit pasteImage(pixmap);
+    return true;
+}
+

src/widget/tool/chattextedit.h

@@ -35,12 +35,14 @@ signals:
     void enterPressed();
     void tabPressed();
     void keyPressed();
+    void pasteImage(const QPixmap& pixmap);
 
 protected:
     virtual void keyPressEvent(QKeyEvent* event) final override;
 
 private:
     void retranslateUi();
+    bool pasteIfImage(QKeyEvent* event);
 
 private:
     QString lastMessage;