[FEATURE] Add a button in guide manager to apply current page's guides

to all other pages

This allows resetting all other pages to use the guide configuration
for the current page. Since guides are now single page only (required
to handle mixed page size/orientation layouts), this is a shortcut
to allow guide configuration to be setup on a single page and then
easily transferred to all other pages in the layout.

python/core/layout/qgslayoutguidecollection.sip

@@ -195,6 +195,11 @@ class QgsLayoutGuideCollection : QAbstractTableModel
 .. seealso:: removeGuide()
 %End
 
+    void applyGuidesToAllOtherPages( int sourcePage );
+%Docstring
+ Resets all other pages' guides to match the guides from the specified ``sourcePage``.
+%End
+
     void update();
 %Docstring
  Updates the position (and visibility) of all guide line items.

src/app/layout/qgslayoutguidewidget.cpp

@@ -52,6 +52,7 @@ QgsLayoutGuideWidget::QgsLayoutGuideWidget( QWidget *parent, QgsLayout *layout,
   connect( mDeleteVertGuideButton, &QPushButton::clicked, this, &QgsLayoutGuideWidget::deleteVerticalGuide );
 
   connect( mClearAllButton, &QPushButton::clicked, this, &QgsLayoutGuideWidget::clearAll );
+  connect( mApplyToAllButton, &QPushButton::clicked, this, &QgsLayoutGuideWidget::applyToAll );
 
   connect( layoutView, &QgsLayoutView::pageChanged, this, &QgsLayoutGuideWidget::pageChanged );
   pageChanged( 0 );
@@ -128,6 +129,11 @@ void QgsLayoutGuideWidget::clearAll()
   mHozProxyModel->removeRows( 0, mHozProxyModel->rowCount() );
 }
 
+void QgsLayoutGuideWidget::applyToAll()
+{
+  mLayout->guides().applyGuidesToAllOtherPages( mPage );
+}
+
 
 QgsLayoutGuidePositionDelegate::QgsLayoutGuidePositionDelegate( QgsLayout *layout, QAbstractItemModel *model )
   : mLayout( layout )

src/app/layout/qgslayoutguidewidget.h

@@ -44,6 +44,8 @@ class QgsLayoutGuideWidget: public QgsPanelWidget, private Ui::QgsLayoutGuideWid
 
     void clearAll();
 
+    void applyToAll();
+
   private:
 
     QgsLayout *mLayout = nullptr;

src/core/layout/qgslayoutguidecollection.cpp

@@ -355,6 +355,35 @@ void QgsLayoutGuideCollection::clear()
   endResetModel();
 }
 
+void QgsLayoutGuideCollection::applyGuidesToAllOtherPages( int sourcePage )
+{
+  // remove other page's guides
+  Q_FOREACH ( QgsLayoutGuide *guide, mGuides )
+  {
+    if ( guide->page() != sourcePage )
+      removeGuide( guide );
+  }
+
+  // remaining guides belong to source page - clone them to other pages
+  Q_FOREACH ( QgsLayoutGuide *guide, mGuides )
+  {
+    for ( int p = 0; p < mLayout->pageCollection()->pageCount(); ++p )
+    {
+      if ( p == sourcePage )
+        continue;
+
+      std::unique_ptr< QgsLayoutGuide> newGuide( new QgsLayoutGuide( guide->orientation(), guide->position() ) );
+      newGuide->setPage( p );
+      newGuide->setLayout( mLayout );
+      if ( newGuide->item()->isVisible() )
+      {
+        // if invisible, new guide is outside of page bounds
+        addGuide( newGuide.release() );
+      }
+    }
+  }
+}
+
 void QgsLayoutGuideCollection::update()
 {
   Q_FOREACH ( QgsLayoutGuide *guide, mGuides )

src/core/layout/qgslayoutguidecollection.h

@@ -219,6 +219,11 @@ class CORE_EXPORT QgsLayoutGuideCollection : public QAbstractTableModel
      */
     void clear();
 
+    /**
+     * Resets all other pages' guides to match the guides from the specified \a sourcePage.
+     */
+    void applyGuidesToAllOtherPages( int sourcePage );
+
     /**
      * Updates the position (and visibility) of all guide line items.
      */

src/ui/layout/qgslayoutguidewidgetbase.ui

@@ -54,8 +54,8 @@
        <rect>
         <x>0</x>
         <y>0</y>
-        <width>231</width>
-        <height>518</height>
+        <width>217</width>
+        <height>526</height>
        </rect>
       </property>
       <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -192,8 +192,21 @@
          </layout>
         </widget>
        </item>
+       <item>
+        <widget class="QPushButton" name="mApplyToAllButton">
+         <property name="toolTip">
+          <string>Resets all other pages' guides to match this page</string>
+         </property>
+         <property name="text">
+          <string>Apply to All Pages</string>
+         </property>
+        </widget>
+       </item>
        <item>
         <widget class="QPushButton" name="mClearAllButton">
+         <property name="toolTip">
+          <string>Removes all guides from the current page</string>
+         </property>
          <property name="text">
           <string>Clear All Guides</string>
          </property>

tests/src/python/test_qgslayoutguides.py

@@ -30,6 +30,8 @@
 
 from qgis.testing import start_app, unittest
 
+import sip
+
 start_app()
 
 
@@ -249,6 +251,48 @@ def testClear(self):
         guides.clear()
         self.assertEqual(guides.guides(QgsLayoutGuide.Horizontal), [])
 
+    def testApplyToOtherPages(self):
+        p = QgsProject()
+        l = QgsLayout(p)
+        l.initializeDefaults()
+        page2 = QgsLayoutItemPage(l)
+        page2.setPageSize('A6')
+        l.pageCollection().addPage(page2)
+        guides = l.guides()
+
+        # add some guides
+        g1 = QgsLayoutGuide(QgsLayoutGuide.Horizontal, QgsLayoutMeasurement(5))
+        guides.addGuide(g1)
+        g2 = QgsLayoutGuide(QgsLayoutGuide.Vertical, QgsLayoutMeasurement(6))
+        guides.addGuide(g2)
+        g3 = QgsLayoutGuide(QgsLayoutGuide.Horizontal, QgsLayoutMeasurement(190))
+        guides.addGuide(g3)
+        g4 = QgsLayoutGuide(QgsLayoutGuide.Horizontal, QgsLayoutMeasurement(1))
+        g4.setPage(1)
+        guides.addGuide(g4)
+
+        # apply guides from page 0 - should delete g4
+        guides.applyGuidesToAllOtherPages(0)
+        self.assertEqual(guides.guides(QgsLayoutGuide.Horizontal, 0), [g1, g3])
+        self.assertEqual(guides.guides(QgsLayoutGuide.Vertical, 0), [g2])
+        self.assertTrue(sip.isdeleted(g4))
+
+        # g3 is outside of page 2 bounds - should not be copied
+        self.assertEqual(len(guides.guides(QgsLayoutGuide.Horizontal, 1)), 1)
+        self.assertEqual(guides.guides(QgsLayoutGuide.Horizontal, 1)[0].position().length(), 5)
+        self.assertEqual(len(guides.guides(QgsLayoutGuide.Vertical, 1)), 1)
+        self.assertEqual(guides.guides(QgsLayoutGuide.Vertical, 1)[0].position().length(), 6)
+
+        # apply guides from page 1 to 0
+        guides.applyGuidesToAllOtherPages(1)
+        self.assertTrue(sip.isdeleted(g1))
+        self.assertTrue(sip.isdeleted(g2))
+        self.assertTrue(sip.isdeleted(g3))
+        self.assertEqual(len(guides.guides(QgsLayoutGuide.Horizontal, 0)), 1)
+        self.assertEqual(guides.guides(QgsLayoutGuide.Horizontal, 0)[0].position().length(), 5)
+        self.assertEqual(len(guides.guides(QgsLayoutGuide.Vertical, 0)), 1)
+        self.assertEqual(guides.guides(QgsLayoutGuide.Vertical, 0)[0].position().length(), 6)
+
 
 if __name__ == '__main__':
     unittest.main()