Edit Book: When inserting images, add an option to insert the image as a full page image

src/calibre/gui2/tweak_book/__init__.py

@@ -71,6 +71,8 @@ d['auto_close_tags'] = True
 d['restore_book_state'] = True
 d['editor_accepts_drops'] = True
 d['toolbar_icon_size'] = 24
+d['insert_full_screen_image'] = False
+d['preserve_aspect_ratio_when_inserting_image'] = False
 del d
 
 ucase_map = {l:string.ascii_uppercase[i] for i, l in enumerate(string.ascii_lowercase)}

src/calibre/gui2/tweak_book/boss.py

@@ -776,14 +776,14 @@ class Boss(QObject):
                 if rdata is None:
                     return
                 if rtype == 'image':
-                    chosen_name, chosen_image_is_external = rdata
+                    chosen_name, chosen_image_is_external, fullpage, preserve_ar = rdata
                     if chosen_image_is_external:
                         with open(chosen_image_is_external[1], 'rb') as f:
                             current_container().add_file(chosen_image_is_external[0], f.read())
                         self.refresh_file_list()
                         chosen_name = chosen_image_is_external[0]
                     href = current_container().name_to_href(chosen_name, edname)
-                    ed.insert_image(href)
+                    ed.insert_image(href, fullpage=fullpage, preserve_aspect_ratio=preserve_ar)
             elif action[0] == 'insert_hyperlink':
                 self.commit_all_editors_to_container()
                 d = InsertLink(current_container(), edname, initial_text=ed.get_smart_selection(), parent=self.gui)

src/calibre/gui2/tweak_book/editor/insert_resource.py

@@ -11,10 +11,10 @@ from functools import partial
 
 from PyQt5.Qt import (
     QGridLayout, QSize, QListView, QStyledItemDelegate, QLabel, QPixmap,
-    QApplication, QSizePolicy, QAbstractListModel, Qt, QRect,
+    QApplication, QSizePolicy, QAbstractListModel, Qt, QRect, QCheckBox,
     QPainter, QModelIndex, QSortFilterProxyModel, QLineEdit, QToolButton,
     QIcon, QFormLayout, pyqtSignal, QTreeWidget, QTreeWidgetItem, QVBoxLayout,
-    QMenu, QInputDialog)
+    QMenu, QInputDialog, QHBoxLayout)
 
 from calibre import fit_image
 from calibre.constants import plugins
@@ -226,7 +226,6 @@ class InsertImage(Dialog):
         l.addWidget(b, 2, 1)
         f.textChanged.connect(self.filter_changed)
 
-        l.addWidget(self.bb, 3, 0, 1, 2)
         if self.for_browsing:
             self.bb.clear()
             self.bb.addButton(self.bb.Close)
@@ -244,6 +243,19 @@ class InsertImage(Dialog):
             b.clicked.connect(self.paste_image)
             b.setIcon(QIcon(I('edit-paste.png')))
             b.setToolTip(_('Paste an image from the clipboard'))
+            self.fullpage = f = QCheckBox(_('Full page image'), self)
+            f.setToolTip(_('Insert the image so that it takes up an entire page when viewed in a reader'))
+            f.setChecked(tprefs['insert_full_screen_image'])
+            self.preserve_aspect_ratio = a = QCheckBox(_('Preserve aspect ratio'))
+            a.setToolTip(_('Preserve the aspect ratio of the inserted image when rendering it full paged'))
+            a.setChecked(tprefs['preserve_aspect_ratio_when_inserting_image'])
+            f.toggled.connect(lambda : (tprefs.set('insert_full_screen_image', f.isChecked()), a.setVisible(f.isChecked())))
+            a.toggled.connect(lambda : tprefs.set('preserve_aspect_ratio_when_inserting_image', a.isChecked()))
+            a.setVisible(f.isChecked())
+            h = QHBoxLayout()
+            l.addLayout(h, 3, 0, 1, -1)
+            h.addWidget(f), h.addStretch(10), h.addWidget(a)
+        l.addWidget(self.bb, 4, 0, 1, 2)
 
     def refresh(self):
         self.d.cover_cache.clear()
@@ -305,7 +317,7 @@ def get_resource_data(rtype, parent):
     if rtype == 'image':
         d = InsertImage(parent)
         if d.exec_() == d.Accepted:
-            return d.chosen_image, d.chosen_image_is_external
+            return d.chosen_image, d.chosen_image_is_external, d.fullpage.isChecked(), d.preserve_aspect_ratio.isChecked()
 
 def create_folder_tree(container):
     root = {}

src/calibre/gui2/tweak_book/editor/text.py

@@ -682,7 +682,7 @@ class TextEdit(PlainTextEdit):
             c.setPosition(c.position() - len(suffix))
         self.setTextCursor(c)
 
-    def insert_image(self, href):
+    def insert_image(self, href, fullpage=False, preserve_aspect_ratio=False):
         c = self.textCursor()
         template, alt = 'url(%s)', ''
         left = min(c.position(), c.anchor)
@@ -690,12 +690,19 @@ class TextEdit(PlainTextEdit):
             left, right = self.get_range_inside_tag()
             c.setPosition(left)
             c.setPosition(right, c.KeepAnchor)
-            alt = _('Image')
-            template = '<img alt="{0}" src="%s" />'.format(alt)
             href = prepare_string_for_xml(href, True)
+            if fullpage:
+                template =  '''\
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" \
+version="1.1" width="100%%" height="100%%" viewBox="0 0 1200 1600" preserveAspectRatio="{}">\
+<image width="1200" height="1600" xlink:href="%s"/>\
+</svg>'''.format('xMidYMid meet' if preserve_aspect_ratio else 'none')
+            else:
+                alt = _('Image')
+                template = '<img alt="{0}" src="%s" />'.format(alt)
         text = template % href
         c.insertText(text)
-        if self.syntax == 'html':
+        if self.syntax == 'html' and not fullpage:
             c.setPosition(left + 10)
             c.setPosition(c.position() + len(alt), c.KeepAnchor)
         else:

src/calibre/gui2/tweak_book/editor/widget.py

@@ -221,8 +221,8 @@ class Editor(QMainWindow):
         func = getattr(self.editor, action)
         func(*args)
 
-    def insert_image(self, href):
+    def insert_image(self, href, fullpage=False, preserve_aspect_ratio=False):
-        self.editor.insert_image(href)
+        self.editor.insert_image(href, fullpage=fullpage, preserve_aspect_ratio=preserve_aspect_ratio)
 
     def insert_hyperlink(self, href, text):
         self.editor.insert_hyperlink(href, text)