QScintilla/MarkupProviders/ImageMarkupDialog.py

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

# Copyright (c) 2017 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to enter data for an image markup.
"""

from __future__ import unicode_literals

from PyQt5.QtCore import pyqtSlot, QSize
from PyQt5.QtGui import QImage, QImageReader
from PyQt5.QtWidgets import QDialog, QDialogButtonBox

from E5Gui.E5PathPicker import E5PathPickerModes

from .Ui_ImageMarkupDialog import Ui_ImageMarkupDialog


class ImageMarkupDialog(QDialog, Ui_ImageMarkupDialog):
    """
    Class implementing a dialog to enter data for an image markup.
    """
    HtmlMode = 0
    MarkDownMode = 1
    RestMode = 2
    
    def __init__(self, mode, parent=None):
        """
        Constructor
        
        @param parent reference to the parent widget
        @type QWidget
        """
        super(ImageMarkupDialog, self).__init__(parent)
        self.setupUi(self)
        
        if mode == ImageMarkupDialog.MarkDownMode:
            self.sizeCheckBox.setEnabled(False)
            self.aspectRatioCheckBox.setEnabled(False)
            self.widthSpinBox.setEnabled(False)
            self.heightSpinBox.setEnabled(False)
        elif mode == ImageMarkupDialog.RestMode:
            self.titleEdit.setEnabled(False)
        
        self.__mode = mode
        self.__originalImageSize = QSize()
    
        filters = {
            'bmp': self.tr("Windows Bitmap File (*.bmp)"),
            'cur': self.tr("Windows Cursor File (*.cur)"),
            'dds': self.tr("DirectDraw-Surface File (*.dds)"),
            'gif': self.tr("Graphic Interchange Format File (*.gif)"),
            'icns': self.tr("Apple Icon File (*.icns)"),
            'ico': self.tr("Windows Icon File (*.ico)"),
            'jp2': self.tr("JPEG2000 File (*.jp2)"),
            'jpg': self.tr("JPEG File (*.jpg)"),
            'jpeg': self.tr("JPEG File (*.jpeg)"),
            'mng': self.tr("Multiple-Image Network Graphics File (*.mng)"),
            'pbm': self.tr("Portable Bitmap File (*.pbm)"),
            'pcx': self.tr("Paintbrush Bitmap File (*.pcx)"),
            'pgm': self.tr("Portable Graymap File (*.pgm)"),
            'png': self.tr("Portable Network Graphics File (*.png)"),
            'ppm': self.tr("Portable Pixmap File (*.ppm)"),
            'sgi': self.tr("Silicon Graphics Image File (*.sgi)"),
            'svg': self.tr("Scalable Vector Graphics File (*.svg)"),
            'svgz': self.tr("Compressed Scalable Vector Graphics File"
                            " (*.svgz)"),
            'tga': self.tr("Targa Graphic File (*.tga)"),
            'tif': self.tr("TIFF File (*.tif)"),
            'tiff': self.tr("TIFF File (*.tiff)"),
            'wbmp': self.tr("WAP Bitmap File (*.wbmp)"),
            'webp': self.tr("WebP Image File (*.webp)"),
            'xbm': self.tr("X11 Bitmap File (*.xbm)"),
            'xpm': self.tr("X11 Pixmap File (*.xpm)"),
        }
        
        inputFormats = []
        readFormats = QImageReader.supportedImageFormats()
        for readFormat in readFormats:
            try:
                inputFormats.append(filters[bytes(readFormat).decode()])
            except KeyError:
                pass
        inputFormats.sort()
        inputFormats.append(self.tr("All Files (*)"))
        if filters["png"] in inputFormats:
            inputFormats.remove(filters["png"])
            inputFormats.insert(0, filters["png"])
        self.imagePicker.setFilters(';;'.join(inputFormats))
        self.imagePicker.setMode(E5PathPickerModes.OpenFileMode)
        
        self.sizeCheckBox.setChecked(True)
        self.aspectRatioCheckBox.setChecked(True)
        
        msh = self.minimumSizeHint()
        self.resize(max(self.width(), msh.width()), msh.height())
        
        self.__updateOkButton()
    
    def __updateOkButton(self):
        """
        Private slot to set the state of the OK button.
        """
        enable = bool(self.imagePicker.text())
        if self.__mode == ImageMarkupDialog.MarkDownMode:
            enable = enable and bool(self.altTextEdit.text())
        
        self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(enable)
    
    @pyqtSlot(str)
    def on_imagePicker_textChanged(self, address):
        """
        Private slot handling changes of the image path.
        
        @param address image address (URL or local path)
        @type str
        """
        if address and "://" not in address:
            image = QImage(address)
            # load the file to set the size spin boxes
            if image.isNull():
                self.widthSpinBox.setValue(0)
                self.heightSpinBox.setValue(0)
                self.__originalImageSize = QSize()
                self.__aspectRatio = 1
            else:
                self.widthSpinBox.setValue(image.width())
                self.heightSpinBox.setValue(image.height())
                self.__originalImageSize = image.size()
                self.__aspectRatio = \
                    float(self.__originalImageSize.height()) / \
                    self.__originalImageSize.width()
        else:
            self.widthSpinBox.setValue(0)
            self.heightSpinBox.setValue(0)
            self.__originalImageSize = QSize()
            self.__aspectRatio = 1
        
        self.__updateOkButton()
    
    @pyqtSlot(str)
    def on_altTextEdit_textChanged(self, txt):
        """
        Private slot handling changes of the alternative text.
        
        @param txt alternative text
        @type str
        """
        self.__updateOkButton()

    @pyqtSlot(bool)
    def on_sizeCheckBox_toggled(self, checked):
        """
        Public slot to reset the width and height spin boxes.
        
        @param checked flag indicating the state of the check box
        @type bool
        """
        if checked:
            self.widthSpinBox.setValue(self.__originalImageSize.width())
            self.heightSpinBox.setValue(self.__originalImageSize.height())
    
    @pyqtSlot(bool)
    def on_aspectRatioCheckBox_toggled(self, checked):
        """
        Public slot to adjust the height to match the original aspect ratio.
        
        @param checked flag indicating the state of the check box
        @type bool
        """
        if checked and self.__originalImageSize.isValid():
            height = self.widthSpinBox.value() * self.__aspectRatio
            self.heightSpinBox.setValue(height)
    
    @pyqtSlot(int)
    def on_widthSpinBox_valueChanged(self, width):
        """
        Private slot to adjust the height spin box.
        
        @param width width for the image
        @type int
        """
        if self.aspectRatioCheckBox.isChecked() and \
                self.widthSpinBox.hasFocus():
            height = width * self.__aspectRatio
            self.heightSpinBox.setValue(height)
    
    @pyqtSlot(int)
    def on_heightSpinBox_valueChanged(self, height):
        """
        Private slot to adjust the width spin box.
        
        @param height height for the image
        @type int
        """
        if self.aspectRatioCheckBox.isChecked() and \
                self.heightSpinBox.hasFocus():
            width = height / self.__aspectRatio
            self.widthSpinBox.setValue(width)
    
    def getData(self):
        """
        Public method to get the entered data.
        
        @return tuple containing the image address, alternative text,
            title text, flag to keep the original size, width and height
        @rtype tuple of (str, str, str, bool, int, int)
        """
        return (
            self.imagePicker.text(),
            self.altTextEdit.text(),
            self.titleEdit.text(),
            self.sizeCheckBox.isChecked(),
            self.widthSpinBox.value(),
            self.heightSpinBox.value(),
        )