Qt 5.7 | Qt WebEngine | WebEngine Demo Browser Example | urllineedit.cpp Example File

Qt 5.7.1 Reference Documentation

# urllineedit.cpp Example File

webenginewidgets/demobrowser/urllineedit.cpp

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      #include "urllineedit.h"

      #include "browserapplication.h"
      #include "searchlineedit.h"
      #include "webview.h"

      #include <QtCore/QEvent>
      #include <QtCore/QMimeData>

      #include <QtWidgets/QApplication>
      #include <QtWidgets/QCompleter>
      #include <QtGui/QFocusEvent>
      #include <QtWidgets/QHBoxLayout>
      #include <QtWidgets/QLabel>
      #include <QtWidgets/QLineEdit>
      #include <QtGui/QDrag>
      #include <QtGui/QPainter>
      #include <QtWidgets/QStyle>
      #include <QtWidgets/QStyleOptionFrame>

      #include <QtCore/QDebug>

      ExLineEdit::ExLineEdit(QWidget *parent)
          : QWidget(parent)
          , m_leftWidget(0)
          , m_lineEdit(new QLineEdit(this))
          , m_clearButton(0)
      {
          setFocusPolicy(m_lineEdit->focusPolicy());
          setAttribute(Qt::WA_InputMethodEnabled);
          setSizePolicy(m_lineEdit->sizePolicy());
          setBackgroundRole(m_lineEdit->backgroundRole());
          setMouseTracking(true);
          setAcceptDrops(true);
          setAttribute(Qt::WA_MacShowFocusRect, true);
          QPalette p = m_lineEdit->palette();
          setPalette(p);

          // line edit
          m_lineEdit->setFrame(false);
          m_lineEdit->setFocusProxy(this);
          m_lineEdit->setAttribute(Qt::WA_MacShowFocusRect, false);
          QPalette clearPalette = m_lineEdit->palette();
          clearPalette.setBrush(QPalette::Base, QBrush(Qt::transparent));
          m_lineEdit->setPalette(clearPalette);

          // clearButton
          m_clearButton = new ClearButton(this);
          connect(m_clearButton, SIGNAL(clicked()),
                  m_lineEdit, SLOT(clear()));
          connect(m_lineEdit, SIGNAL(textChanged(QString)),
                  m_clearButton, SLOT(textChanged(QString)));
      }

      void ExLineEdit::setLeftWidget(QWidget *widget)
      {
          m_leftWidget = widget;
      }

      QWidget *ExLineEdit::leftWidget() const
      {
          return m_leftWidget;
      }

      void ExLineEdit::resizeEvent(QResizeEvent *event)
      {
          Q_ASSERT(m_leftWidget);
          updateGeometries();
          QWidget::resizeEvent(event);
      }

      void ExLineEdit::updateGeometries()
      {
          QStyleOptionFrame panel;
          initStyleOption(&panel);
          QRect rect = style()->subElementRect(QStyle::SE_LineEditContents, &panel, this);

          int height = rect.height();
          int width = rect.width();

          int m_leftWidgetHeight = m_leftWidget->height();
          m_leftWidget->setGeometry(rect.x() + 2,          rect.y() + (height - m_leftWidgetHeight)/2,
                                    m_leftWidget->width(), m_leftWidget->height());

          int clearButtonWidth = this->height();
          m_lineEdit->setGeometry(m_leftWidget->x() + m_leftWidget->width(),        0,
                                  width - clearButtonWidth - m_leftWidget->width(), this->height());

          m_clearButton->setGeometry(this->width() - clearButtonWidth, 0,
                                     clearButtonWidth, this->height());
      }

      void ExLineEdit::initStyleOption(QStyleOptionFrame *option) const
      {
          option->initFrom(this);
          option->rect = contentsRect();
          option->lineWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth, option, this);
          option->midLineWidth = 0;
          option->state |= QStyle::State_Sunken;
          if (m_lineEdit->isReadOnly())
              option->state |= QStyle::State_ReadOnly;
      #ifdef QT_KEYPAD_NAVIGATION
          if (hasEditFocus())
              option->state |= QStyle::State_HasEditFocus;
      #endif
          option->features = QStyleOptionFrame::None;
      }

      QSize ExLineEdit::sizeHint() const
      {
          m_lineEdit->setFrame(true);
          QSize size = m_lineEdit->sizeHint();
          m_lineEdit->setFrame(false);
          return size;
      }

      void ExLineEdit::focusInEvent(QFocusEvent *event)
      {
          m_lineEdit->event(event);
          QWidget::focusInEvent(event);
      }

      void ExLineEdit::focusOutEvent(QFocusEvent *event)
      {
          m_lineEdit->event(event);

          if (m_lineEdit->completer()) {
              connect(m_lineEdit->completer(), SIGNAL(activated(QString)),
                               m_lineEdit, SLOT(setText(QString)));
              connect(m_lineEdit->completer(), SIGNAL(highlighted(QString)),
                               m_lineEdit, SLOT(_q_completionHighlighted(QString)));
          }
          QWidget::focusOutEvent(event);
      }

      void ExLineEdit::keyPressEvent(QKeyEvent *event)
      {
          m_lineEdit->event(event);
      }

      bool ExLineEdit::event(QEvent *event)
      {
          if (event->type() == QEvent::ShortcutOverride)
              return m_lineEdit->event(event);
          return QWidget::event(event);
      }

      void ExLineEdit::paintEvent(QPaintEvent *)
      {
          QPainter p(this);
          QStyleOptionFrame panel;
          initStyleOption(&panel);
          style()->drawPrimitive(QStyle::PE_PanelLineEdit, &panel, &p, this);
      }

      QVariant ExLineEdit::inputMethodQuery(Qt::InputMethodQuery property) const
      {
          return m_lineEdit->inputMethodQuery(property);
      }

      void ExLineEdit::inputMethodEvent(QInputMethodEvent *e)
      {
          m_lineEdit->event(e);
      }

      class UrlIconLabel : public QLabel
      {

      public:
          UrlIconLabel(QWidget *parent);

          WebView *m_webView;

      protected:
          void mousePressEvent(QMouseEvent *event);
          void mouseMoveEvent(QMouseEvent *event);

      private:
          QPoint m_dragStartPos;

      };

      UrlIconLabel::UrlIconLabel(QWidget *parent)
          : QLabel(parent)
          , m_webView(0)
      {
          setMinimumWidth(16);
          setMinimumHeight(16);
      }

      void UrlIconLabel::mousePressEvent(QMouseEvent *event)
      {
          if (event->button() == Qt::LeftButton)
              m_dragStartPos = event->pos();
          QLabel::mousePressEvent(event);
      }

      void UrlIconLabel::mouseMoveEvent(QMouseEvent *event)
      {
          if (event->buttons() == Qt::LeftButton
              && (event->pos() - m_dragStartPos).manhattanLength() > QApplication::startDragDistance()
               && m_webView) {
              QDrag *drag = new QDrag(this);
              QMimeData *mimeData = new QMimeData;
              mimeData->setText(QString::fromUtf8(m_webView->url().toEncoded()));
              QList<QUrl> urls;
              urls.append(m_webView->url());
              mimeData->setUrls(urls);
              drag->setMimeData(mimeData);
              drag->exec();
          }
      }

      UrlLineEdit::UrlLineEdit(QWidget *parent)
          : ExLineEdit(parent)
          , m_webView(0)
          , m_iconLabel(0)
      {
          // icon
          m_iconLabel = new UrlIconLabel(this);
          m_iconLabel->resize(16, 16);
          setLeftWidget(m_iconLabel);
          m_defaultBaseColor = palette().color(QPalette::Base);
      }

      void UrlLineEdit::setWebView(WebView *webView)
      {
          Q_ASSERT(!m_webView);
          m_webView = webView;
          m_iconLabel->m_webView = webView;
          connect(webView, SIGNAL(urlChanged(QUrl)),
              this, SLOT(webViewUrlChanged(QUrl)));
          connect(webView, SIGNAL(iconChanged(QIcon)),
              this, SLOT(webViewIconChanged(QIcon)));
          connect(webView, SIGNAL(loadProgress(int)),
              this, SLOT(update()));
      }

      void UrlLineEdit::webViewUrlChanged(const QUrl &url)
      {
          m_lineEdit->setText(QString::fromUtf8(url.toEncoded()));
          m_lineEdit->setCursorPosition(0);
      }

      void UrlLineEdit::webViewIconChanged(const QIcon &icon)
      {
          Q_ASSERT(m_webView);
          m_iconLabel->setPixmap(icon.pixmap(16, 16));
      }

      QLinearGradient UrlLineEdit::generateGradient(const QColor &color) const
      {
          QLinearGradient gradient(0, 0, 0, height());
          gradient.setColorAt(0, m_defaultBaseColor);
          gradient.setColorAt(0.15, color.lighter(120));
          gradient.setColorAt(0.5, color);
          gradient.setColorAt(0.85, color.lighter(120));
          gradient.setColorAt(1, m_defaultBaseColor);
          return gradient;
      }

      void UrlLineEdit::focusOutEvent(QFocusEvent *event)
      {
          if (m_lineEdit->text().isEmpty() && m_webView)
              m_lineEdit->setText(QString::fromUtf8(m_webView->url().toEncoded()));
          ExLineEdit::focusOutEvent(event);
      }

      void UrlLineEdit::paintEvent(QPaintEvent *event)
      {
          QPalette p = palette();
          if (m_webView && m_webView->url().scheme() == QLatin1String("https")) {
              QColor lightYellow(248, 248, 210);
              p.setBrush(QPalette::Base, generateGradient(lightYellow));
          } else {
              p.setBrush(QPalette::Base, m_defaultBaseColor);
          }
          setPalette(p);
          ExLineEdit::paintEvent(event);

          QPainter painter(this);
          QStyleOptionFrame panel;
          initStyleOption(&panel);
          QRect backgroundRect = style()->subElementRect(QStyle::SE_LineEditContents, &panel, this);
          if (m_webView && !hasFocus()) {
              int progress = m_webView->progress();
              QColor loadingColor = QColor(116, 192, 250);
              painter.setBrush(generateGradient(loadingColor));
              painter.setPen(Qt::transparent);
              int mid = backgroundRect.width() / 100.0f * progress;
              QRect progressRect(backgroundRect.x(), backgroundRect.y(), mid, backgroundRect.height());
              painter.drawRect(progressRect);
          }
      }