src/eric7/WebBrowser/WebBrowserTabBar.py

# -*- coding: utf-8 -*-

# Copyright (c) 2010 - 2022 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a specialized tab bar for the web browser.
"""

from PyQt6.QtCore import Qt, QPoint, QTimer, QEvent
from PyQt6.QtWidgets import QLabel

from eric7.EricWidgets.EricTabWidget import EricWheelTabBar
from eric7.EricWidgets.EricPassivePopup import EricPassivePopup, EricPassivePopupStyle

from eric7 import Preferences


class WebBrowserTabBar(EricWheelTabBar):
    """
    Class implementing the tab bar of the web browser.
    """

    def __init__(self, parent=None):
        """
        Constructor

        @param parent reference to the parent widget (WebBrowserTabWidget)
        """
        super().__init__(parent)

        self.__tabWidget = parent

        self.__previewPopup = None

        self.setMouseTracking(True)

    def __showTabPreview(self, index):
        """
        Private slot to show the tab preview.

        @param index index of tab to show a preview for
        @type int
        """
        indexedBrowser = self.__tabWidget.browserAt(index)
        currentBrowser = self.__tabWidget.currentBrowser()

        if indexedBrowser is None or currentBrowser is None:
            return

        # no previews during load
        if indexedBrowser.progress() != 0:
            return

        preview = indexedBrowser.getPreview()
        if not preview.isNull():
            w = self.tabSizeHint(index).width()
            h = int(w * currentBrowser.height() / currentBrowser.width())

            self.__previewPopup = EricPassivePopup(
                style=EricPassivePopupStyle.STYLED, parent=self
            )
            self.__previewPopup.setFixedSize(w, h)
            self.__previewPopup.setCustomData("index", index)

            label = QLabel()
            label.setPixmap(preview.scaled(w, h))

            self.__previewPopup.setView(label)
            self.__previewPopup.layout().setAlignment(Qt.AlignmentFlag.AlignTop)
            self.__previewPopup.layout().setContentsMargins(0, 0, 0, 0)

            tr = self.tabRect(index)
            pos = QPoint(tr.x(), tr.y() + tr.height())

            self.__previewPopup.show(self.mapToGlobal(pos))

    def __hidePreview(self):
        """
        Private method to hide the preview.
        """
        if self.__previewPopup is not None:
            self.__previewPopup.hide()
            self.__previewPopup.deleteLater()
        self.__previewPopup = None

    def mouseMoveEvent(self, evt):
        """
        Protected method to handle mouse move events.

        @param evt reference to the mouse move event (QMouseEvent)
        """
        if self.count() == 1:
            return

        super().mouseMoveEvent(evt)

        if Preferences.getWebBrowser("ShowPreview"):
            # Find the tab under the mouse
            i = 0
            tabIndex = -1
            while i < self.count() and tabIndex == -1:
                if self.tabRect(i).contains(evt.position().toPoint()):
                    tabIndex = i
                i += 1

            # If found and not the current tab then show tab preview
            if (
                tabIndex != -1
                and tabIndex != self.currentIndex()
                and evt.buttons() == Qt.MouseButton.NoButton
                and (
                    self.__previewPopup is None
                    or (
                        self.__previewPopup is not None
                        and self.__previewPopup.getCustomData("index") != tabIndex
                    )
                )
            ):
                QTimer.singleShot(0, lambda: self.__showTabPreview(tabIndex))

            # If current tab or not found then hide previous tab preview
            if tabIndex in (self.currentIndex(), -1):
                self.__hidePreview()

    def leaveEvent(self, evt):
        """
        Protected method to handle leave events.

        @param evt reference to the leave event (QEvent)
        """
        if Preferences.getWebBrowser("ShowPreview"):
            # If leave tabwidget then hide previous tab preview
            self.__hidePreview()

        super().leaveEvent(evt)

    def mousePressEvent(self, evt):
        """
        Protected method to handle mouse press events.

        @param evt reference to the mouse press event (QMouseEvent)
        """
        if Preferences.getWebBrowser("ShowPreview"):
            self.__hidePreview()

        super().mousePressEvent(evt)

    def event(self, evt):
        """
        Public method to handle event.

        This event handler just handles the tooltip event and passes the
        handling of all others to the superclass.

        @param evt reference to the event to be handled (QEvent)
        @return flag indicating, if the event was handled (boolean)
        """
        if evt.type() == QEvent.Type.ToolTip and Preferences.getWebBrowser(
            "ShowPreview"
        ):
            # suppress tool tips if we are showing previews
            evt.setAccepted(True)
            return True

        return super().event(evt)

    def tabRemoved(self, index):
        """
        Public slot to handle the removal of a tab.

        @param index index of the removed tab (integer)
        """
        if Preferences.getWebBrowser("ShowPreview"):
            self.__hidePreview()