Formalize zero-width emote implementation (#4314)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/TooltipEntryWidget.cpp

@@ -0,0 +1,119 @@
+#include "widgets/TooltipEntryWidget.hpp"
+
+#include <QVBoxLayout>
+
+namespace chatterino {
+
+TooltipEntryWidget::TooltipEntryWidget(QWidget *parent)
+    : TooltipEntryWidget(nullptr, "", 0, 0, parent)
+{
+}
+
+TooltipEntryWidget::TooltipEntryWidget(ImagePtr image, const QString &text,
+                                       int customWidth, int customHeight,
+                                       QWidget *parent)
+    : QWidget(parent)
+    , image_(image)
+    , customImgWidth_(customWidth)
+    , customImgHeight_(customHeight)
+{
+    auto *layout = new QVBoxLayout(this);
+    layout->setContentsMargins(0, 0, 0, 0);
+    this->setLayout(layout);
+
+    this->displayImage_ = new QLabel();
+    this->displayImage_->setAlignment(Qt::AlignHCenter);
+    this->displayImage_->setStyleSheet("background: transparent");
+    this->displayText_ = new QLabel(text);
+    this->displayText_->setAlignment(Qt::AlignHCenter);
+    this->displayText_->setStyleSheet("background: transparent");
+
+    layout->addWidget(this->displayImage_);
+    layout->addWidget(this->displayText_);
+}
+
+void TooltipEntryWidget::setWordWrap(bool wrap)
+{
+    this->displayText_->setWordWrap(wrap);
+}
+
+void TooltipEntryWidget::setImageScale(int w, int h)
+{
+    if (this->customImgWidth_ == w && this->customImgHeight_ == h)
+    {
+        return;
+    }
+    this->customImgWidth_ = w;
+    this->customImgHeight_ = h;
+    this->refreshPixmap();
+}
+
+void TooltipEntryWidget::setText(const QString &text)
+{
+    this->displayText_->setText(text);
+}
+
+void TooltipEntryWidget::setImage(ImagePtr image)
+{
+    if (this->image_ == image)
+    {
+        return;
+    }
+
+    this->clearImage();
+    this->image_ = std::move(image);
+    this->refreshPixmap();
+}
+
+void TooltipEntryWidget::clearImage()
+{
+    this->displayImage_->hide();
+    this->image_ = nullptr;
+    this->setImageScale(0, 0);
+}
+
+bool TooltipEntryWidget::refreshPixmap()
+{
+    if (!this->image_)
+    {
+        return false;
+    }
+
+    auto pixmap = this->image_->pixmapOrLoad();
+    if (!pixmap)
+    {
+        this->attemptRefresh_ = true;
+        return false;
+    }
+
+    if (this->customImgWidth_ > 0 || this->customImgHeight_ > 0)
+    {
+        this->displayImage_->setPixmap(pixmap->scaled(this->customImgWidth_,
+                                                      this->customImgHeight_,
+                                                      Qt::KeepAspectRatio));
+    }
+    else
+    {
+        this->displayImage_->setPixmap(*pixmap);
+    }
+    this->displayImage_->show();
+
+    return true;
+}
+
+bool TooltipEntryWidget::animated() const
+{
+    return this->image_ && this->image_->animated();
+}
+
+bool TooltipEntryWidget::hasImage() const
+{
+    return this->image_ != nullptr;
+}
+
+bool TooltipEntryWidget::attemptRefresh() const
+{
+    return this->attemptRefresh_;
+}
+
+}  // namespace chatterino