E-book viewer: Add an option to control the maximum text height in full screen. Note that it only owrks if the viewer is in paged mode (which is the default mode).

src/calibre/ebooks/oeb/display/full_screen.coffee

@@ -25,9 +25,10 @@ class FullScreen
         this.initial_left_margin = bs.marginLeft
         this.initial_right_margin = bs.marginRight
 
-    on: (max_text_width, in_paged_mode) ->
+    on: (max_text_width, max_text_height, in_paged_mode) ->
         if in_paged_mode
             window.paged_display.max_col_width = max_text_width
+            window.paged_display.max_col_height = max_text_height
         else
             s = document.body.style
             s.maxWidth = max_text_width + 'px'

src/calibre/ebooks/oeb/display/paged.coffee

@@ -26,6 +26,7 @@ class PagedDisplay
         this.current_margin_side = 0
         this.is_full_screen_layout = false
         this.max_col_width = -1
+        this.max_col_height = - 1
         this.current_page_height = null
         this.document_margins = null
         this.use_document_margins = false
@@ -71,10 +72,14 @@ class PagedDisplay
             this.margin_top = this.document_margins.top or margin_top
             this.margin_bottom = this.document_margins.bottom or margin_bottom
             this.margin_side = this.document_margins.left or this.document_margins.right or margin_side
+            this.effective_margin_top = this.margin_top
+            this.effective_margin_bottom = this.margin_bottom
         else
             this.margin_top = margin_top
             this.margin_side = margin_side
             this.margin_bottom = margin_bottom
+            this.effective_margin_top = this.margin_top
+            this.effective_margin_bottom = this.margin_bottom
 
     handle_rtl_body: (body_style) ->
         if body_style.direction == "rtl"
@@ -118,7 +123,6 @@ class PagedDisplay
         this.col_width = col_width
         this.page_width = col_width + 2*sm
         this.screen_width = this.page_width * this.cols_per_screen
-        this.current_page_height = window.innerHeight - this.margin_top - this.margin_bottom
 
         fgcolor = body_style.getPropertyValue('color')
 
@@ -142,12 +146,20 @@ class PagedDisplay
         if c?.nodeType == 1
             c.style.setProperty('-webkit-margin-before', '0')
 
+        this.effective_margin_top = this.margin_top
+        this.effective_margin_bottom = this.margin_bottom
+        this.current_page_height = window.innerHeight - this.margin_top - this.margin_bottom
+        if this.max_col_height > 0 and this.current_page_height > this.max_col_height
+            eh = Math.ceil((this.current_page_height - this.max_col_height) / 2)
+            this.effective_margin_top += eh
+            this.effective_margin_bottom += eh
+            this.current_page_height -= 2 * eh
 
         bs.setProperty('overflow', 'visible')
-        bs.setProperty('height', (window.innerHeight - this.margin_top - this.margin_bottom) + 'px')
+        bs.setProperty('height', this.current_page_height + 'px')
         bs.setProperty('width', (window.innerWidth - 2*sm)+'px')
-        bs.setProperty('margin-top', this.margin_top + 'px')
+        bs.setProperty('margin-top', this.effective_margin_top + 'px')
-        bs.setProperty('margin-bottom', this.margin_bottom+'px')
+        bs.setProperty('margin-bottom', this.effective_margin_bottom+'px')
         bs.setProperty('margin-left', sm+'px')
         bs.setProperty('margin-right', sm+'px')
         for edge in ['left', 'right', 'top', 'bottom']
@@ -193,12 +205,12 @@ class PagedDisplay
     create_header_footer: (uuid) ->
         if this.header_template != null
             this.header = document.createElement('div')
-            this.header.setAttribute('style', "overflow:hidden; display:block; position:absolute; left:#{ this.side_margin }px; top: 0px; height: #{ this.margin_top }px; width: #{ this.col_width }px; margin: 0; padding: 0")
+            this.header.setAttribute('style', "overflow:hidden; display:block; position:absolute; left:#{ this.side_margin }px; top: 0px; height: #{ this.effective_margin_top }px; width: #{ this.col_width }px; margin: 0; padding: 0")
             this.header.setAttribute('id', 'pdf_page_header_'+uuid)
             document.body.appendChild(this.header)
         if this.footer_template != null
             this.footer = document.createElement('div')
-            this.footer.setAttribute('style', "overflow:hidden; display:block; position:absolute; left:#{ this.side_margin }px; top: #{ window.innerHeight - this.margin_bottom }px; height: #{ this.margin_bottom }px; width: #{ this.col_width }px; margin: 0; padding: 0")
+            this.footer.setAttribute('style', "overflow:hidden; display:block; position:absolute; left:#{ this.side_margin }px; top: #{ window.innerHeight - this.effective_margin_bottom }px; height: #{ this.effective_margin_bottom }px; width: #{ this.col_width }px; margin: 0; padding: 0")
             this.footer.setAttribute('id', 'pdf_page_footer_'+uuid)
             document.body.appendChild(this.footer)
         if this.header != null or this.footer != null
@@ -501,8 +513,8 @@ class PagedDisplay
                     continue
                 deltax = Math.floor(this.page_width/25)
                 deltay = Math.floor(window.innerHeight/25)
-                cury = this.margin_top
+                cury = this.effective_margin_top
-                until cury >= (window.innerHeight - this.margin_bottom)
+                until cury >= (window.innerHeight - this.effective_margin_bottom)
                     curx = left + this.current_margin_side
                     until curx >= (right - this.current_margin_side)
                         cfi = window.cfi.at_point(curx-window.pageXOffset, cury-window.pageYOffset)

src/calibre/gui2/viewer/config.py

@@ -35,6 +35,10 @@ def config(defaults=None):
         help=_("Set the maximum width that the book's text and pictures will take"
         " when in fullscreen mode. This allows you to read the book text"
         " without it becoming too wide."))
+    c.add_opt('max_fs_height', default=-1,
+        help=_("Set the maximum height that the book's text and pictures will take"
+        " when in fullscreen mode. This allows you to read the book text"
+        " without it becoming too tall. Note that this setting only takes effect in paged mode (which is the default mode)."))
     c.add_opt('fit_images', default=True,
             help=_('Resize images larger than the viewer window to fit inside it'))
     c.add_opt('hyphenate', default=False, help=_('Hyphenate text'))
@@ -211,6 +215,7 @@ class ConfigDialog(QDialog, Ui_Dialog):
                 {'serif':0, 'sans':1, 'mono':2}[opts.standard_font])
         self.css.setPlainText(opts.user_css)
         self.max_fs_width.setValue(opts.max_fs_width)
+        self.max_fs_height.setValue(opts.max_fs_height)
         pats, names = self.hyphenate_pats, self.hyphenate_names
         try:
             idx = pats.index(opts.hyphenate_default_lang)
@@ -287,6 +292,10 @@ class ConfigDialog(QDialog, Ui_Dialog):
         c.set('remember_window_size', self.opt_remember_window_size.isChecked())
         c.set('fit_images', self.opt_fit_images.isChecked())
         c.set('max_fs_width', int(self.max_fs_width.value()))
+        max_fs_height = self.max_fs_height.value()
+        if max_fs_height <= self.max_fs_height.minimum():
+            max_fs_height = -1
+        c.set('max_fs_height', max_fs_height)
         c.set('hyphenate', self.hyphenate.isChecked())
         c.set('remember_current_page', self.opt_remember_current_page.isChecked())
         c.set('wheel_flips_pages', self.opt_wheel_flips_pages.isChecked())

src/calibre/gui2/viewer/config.ui

@@ -60,7 +60,7 @@ QToolBox::tab:hover {
 }</string>
          </property>
          <property name="currentIndex">
-          <number>0</number>
+          <number>2</number>
          </property>
          <widget class="QWidget" name="page">
           <property name="geometry">
@@ -404,41 +404,67 @@ QToolBox::tab:hover {
              </property>
             </widget>
            </item>
-           <item row="1" column="0">
+           <item row="6" column="0" colspan="2">
-            <widget class="QCheckBox" name="opt_fullscreen_clock">
-             <property name="text">
-              <string>Show &amp;clock in full screen mode</string>
-             </property>
-            </widget>
-           </item>
-           <item row="5" column="0" colspan="2">
             <widget class="QCheckBox" name="opt_fullscreen_pos">
              <property name="text">
               <string>Show reading &amp;position in full screen mode</string>
              </property>
             </widget>
            </item>
-           <item row="4" column="0" colspan="2">
+           <item row="5" column="0" colspan="2">
             <widget class="QCheckBox" name="opt_fullscreen_scrollbar">
              <property name="text">
               <string>Show &amp;scrollbar in full screen mode</string>
              </property>
             </widget>
            </item>
-           <item row="3" column="0" colspan="2">
+           <item row="4" column="0" colspan="2">
             <widget class="QCheckBox" name="opt_start_in_fullscreen">
              <property name="text">
               <string>&amp;Start viewer in full screen mode</string>
              </property>
             </widget>
            </item>
-           <item row="2" column="0" colspan="2">
+           <item row="3" column="0" colspan="2">
             <widget class="QCheckBox" name="opt_show_fullscreen_help">
              <property name="text">
               <string>Show &amp;help message when starting full screen mode</string>
              </property>
             </widget>
            </item>
+           <item row="1" column="0">
+            <widget class="QLabel" name="label_24">
+             <property name="text">
+              <string>Maximum text height in fullscreen (paged mode):</string>
+             </property>
+            </widget>
+           </item>
+           <item row="2" column="0" colspan="2">
+            <widget class="QCheckBox" name="opt_fullscreen_clock">
+             <property name="text">
+              <string>Show &amp;clock in full screen mode</string>
+             </property>
+            </widget>
+           </item>
+           <item row="1" column="1">
+            <widget class="QSpinBox" name="max_fs_height">
+             <property name="specialValueText">
+              <string>Disabled</string>
+             </property>
+             <property name="suffix">
+              <string> px</string>
+             </property>
+             <property name="minimum">
+              <number>100</number>
+             </property>
+             <property name="maximum">
+              <number>10000</number>
+             </property>
+             <property name="singleStep">
+              <number>25</number>
+             </property>
+            </widget>
+           </item>
           </layout>
          </widget>
          <widget class="QWidget" name="page_6">

src/calibre/gui2/viewer/documentview.py

@@ -160,6 +160,7 @@ class Document(QWebPage):  # {{{
         screen_width = QApplication.desktop().screenGeometry().width()
         # Leave some space for the scrollbar and some border
         self.max_fs_width = min(opts.max_fs_width, screen_width-50)
+        self.max_fs_height = opts.max_fs_height
         self.fullscreen_clock = opts.fullscreen_clock
         self.fullscreen_scrollbar = opts.fullscreen_scrollbar
         self.fullscreen_pos = opts.fullscreen_pos
@@ -310,7 +311,7 @@ class Document(QWebPage):  # {{{
 
     def switch_to_fullscreen_mode(self):
         self.in_fullscreen_mode = True
-        self.javascript('full_screen.on(%d, %s)'%(self.max_fs_width,
+        self.javascript('full_screen.on(%d, %d, %s)'%(self.max_fs_width, self.max_fs_height,
             'true' if self.in_paged_mode else 'false'))
 
     def switch_to_window_mode(self):