From db20d01f3c422143dfccb3cf210ea3091674ec69 Mon Sep 17 00:00:00 2001
From: BigBahss <tdennis4496@gmail.com>
Date: Sun, 11 Oct 2020 12:07:11 -0400
Subject: [PATCH] Focus map zoom on currently hovered metatile

---
 forms/mainwindow.ui | 46 +++++++++++++++++++------------
 src/mainwindow.cpp  | 66 +++++++++++++++++++++++++++++++--------------
 2 files changed, 75 insertions(+), 37 deletions(-)

diff --git a/forms/mainwindow.ui b/forms/mainwindow.ui
index 7fc0974c..3e7535e5 100644
--- a/forms/mainwindow.ui
+++ b/forms/mainwindow.ui
@@ -236,23 +236,23 @@
         </property>
         <item>
          <layout class="QHBoxLayout" name="horizontalLayout_10">
-           <item>
-            <widget class="QTabBar" name="mainTabBar" native="true"/>
-           </item>
-           <item>
-            <spacer name="horizontalSpacer_20">
-             <property name="orientation">
-              <enum>Qt::Horizontal</enum>
-             </property>
-             <property name="sizeHint" stdset="0">
-              <size>
-               <width>40</width>
-               <height>20</height>
-              </size>
-             </property>
-            </spacer>
-           </item>
-          </layout>
+          <item>
+           <widget class="QTabBar" name="mainTabBar" native="true"/>
+          </item>
+          <item>
+           <spacer name="horizontalSpacer_20">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>40</width>
+              <height>20</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
+         </layout>
         </item>
         <item>
          <widget class="QStackedWidget" name="mainStackedWidget">
@@ -357,6 +357,12 @@
                        <verstretch>0</verstretch>
                       </sizepolicy>
                      </property>
+                     <property name="verticalScrollBarPolicy">
+                      <enum>Qt::ScrollBarAlwaysOff</enum>
+                     </property>
+                     <property name="horizontalScrollBarPolicy">
+                      <enum>Qt::ScrollBarAlwaysOff</enum>
+                     </property>
                      <property name="widgetResizable">
                       <bool>true</bool>
                      </property>
@@ -438,6 +444,12 @@
                          <property name="autoFillBackground">
                           <bool>false</bool>
                          </property>
+                         <property name="verticalScrollBarPolicy">
+                          <enum>Qt::ScrollBarAsNeeded</enum>
+                         </property>
+                         <property name="horizontalScrollBarPolicy">
+                          <enum>Qt::ScrollBarAsNeeded</enum>
+                         </property>
                          <property name="sizeAdjustPolicy">
                           <enum>QAbstractScrollArea::AdjustIgnored</enum>
                          </property>
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index d98ed68a..c06db464 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -1451,13 +1451,39 @@ void MainWindow::scaleMapView(int s) {
         double exp  = editor->scale_exp;
         double sfactor = pow(base,s);
 
+        ui->graphicsView_Map->setUpdatesEnabled(false);
+
+        const auto mapAnchor = ui->graphicsView_Map->transformationAnchor();
+        const auto connectionsAnchor = ui->graphicsView_Connections->transformationAnchor();
+        ui->graphicsView_Map->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
+        ui->graphicsView_Connections->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
+
         ui->graphicsView_Map->scale(sfactor,sfactor);
         ui->graphicsView_Connections->scale(sfactor,sfactor);
 
         int width = static_cast<int>(ceil((editor->scene->width()) * pow(base,exp))) + 2;
         int height = static_cast<int>(ceil((editor->scene->height()) * pow(base,exp))) + 2;
-        ui->graphicsView_Map->setFixedSize(width, height);
-        ui->graphicsView_Connections->setFixedSize(width, height);
+        QSize viewSize = ui->scrollAreaWidgetContents_5->size();
+
+        if (width < viewSize.width()) {
+            ui->graphicsView_Map->setFixedWidth(width);
+            ui->graphicsView_Connections->setFixedWidth(width);
+        } else {
+            ui->graphicsView_Map->setFixedWidth(viewSize.width());
+            ui->graphicsView_Connections->setFixedWidth(viewSize.width());
+        }
+        if (height < viewSize.height()) {
+            ui->graphicsView_Map->setFixedHeight(height);
+            ui->graphicsView_Connections->setFixedHeight(height);
+        } else {
+            ui->graphicsView_Map->setFixedHeight(viewSize.height());
+            ui->graphicsView_Connections->setFixedHeight(viewSize.height());
+        }
+
+        ui->graphicsView_Map->setTransformationAnchor(mapAnchor);
+        ui->graphicsView_Connections->setTransformationAnchor(connectionsAnchor);
+
+        ui->graphicsView_Map->setUpdatesEnabled(true);
     }
 }
 
@@ -2139,9 +2165,9 @@ void MainWindow::on_toolButton_Paint_clicked()
     if (ui->tabWidget_2->currentIndex() == 0)
         editor->cursorMapTileRect->stopSingleTileMode();
 
-    ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    QScroller::ungrabGesture(ui->scrollArea);
+    ui->graphicsView_Map->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->graphicsView_Map->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    QScroller::ungrabGesture(ui->graphicsView_Map);
 
     checkToolButtons();
 }
@@ -2156,9 +2182,9 @@ void MainWindow::on_toolButton_Select_clicked()
     editor->settings->mapCursor = QCursor();
     editor->cursorMapTileRect->setSingleTileMode();
 
-    ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    QScroller::ungrabGesture(ui->scrollArea);
+    ui->graphicsView_Map->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->graphicsView_Map->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    QScroller::ungrabGesture(ui->graphicsView_Map);
 
     checkToolButtons();
 }
@@ -2173,9 +2199,9 @@ void MainWindow::on_toolButton_Fill_clicked()
     editor->settings->mapCursor = QCursor(QPixmap(":/icons/fill_color_cursor.ico"), 10, 10);
     editor->cursorMapTileRect->setSingleTileMode();
 
-    ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    QScroller::ungrabGesture(ui->scrollArea);
+    ui->graphicsView_Map->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->graphicsView_Map->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    QScroller::ungrabGesture(ui->graphicsView_Map);
 
     checkToolButtons();
 }
@@ -2190,9 +2216,9 @@ void MainWindow::on_toolButton_Dropper_clicked()
     editor->settings->mapCursor = QCursor(QPixmap(":/icons/pipette_cursor.ico"), 10, 10);
     editor->cursorMapTileRect->setSingleTileMode();
 
-    ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    QScroller::ungrabGesture(ui->scrollArea);
+    ui->graphicsView_Map->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->graphicsView_Map->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    QScroller::ungrabGesture(ui->graphicsView_Map);
 
     checkToolButtons();
 }
@@ -2207,9 +2233,9 @@ void MainWindow::on_toolButton_Move_clicked()
     editor->settings->mapCursor = QCursor(QPixmap(":/icons/move.ico"), 7, 7);
     editor->cursorMapTileRect->setSingleTileMode();
 
-    ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
-    ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
-    QScroller::grabGesture(ui->scrollArea, QScroller::LeftMouseButtonGesture);
+    ui->graphicsView_Map->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    ui->graphicsView_Map->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    QScroller::grabGesture(ui->graphicsView_Map, QScroller::LeftMouseButtonGesture);
 
     checkToolButtons();
 }
@@ -2224,9 +2250,9 @@ void MainWindow::on_toolButton_Shift_clicked()
     editor->settings->mapCursor = QCursor(QPixmap(":/icons/shift_cursor.ico"), 10, 10);
     editor->cursorMapTileRect->setSingleTileMode();
 
-    ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
-    QScroller::ungrabGesture(ui->scrollArea);
+    ui->graphicsView_Map->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->graphicsView_Map->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    QScroller::ungrabGesture(ui->graphicsView_Map);
 
     checkToolButtons();
 }