From 46943de6e3a689c9424a0ce326d173ede4e47d4d Mon Sep 17 00:00:00 2001
From: cneben <benoit@destrat.io>
Date: Sat, 24 Aug 2024 16:26:00 +0200
Subject: [PATCH] Add qan::Navigable::center() method. Polish.

Signed-off-by: cneben <benoit@destrat.io>
---
 samples/groups/groups.qml |  2 ++
 src/qanNavigable.cpp      | 23 ++++++++++++++++++-----
 src/qanNavigable.h        |  3 +++
 3 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/samples/groups/groups.qml b/samples/groups/groups.qml
index 18c76e8a..a91c3f44 100644
--- a/samples/groups/groups.qml
+++ b/samples/groups/groups.qml
@@ -42,6 +42,8 @@ ApplicationWindow {
     ToolTip { x: 0; id: toolTip; timeout: 2000 }
     function notifyUser(message) { toolTip.text = message; toolTip.open() }
 
+    Component.onCompleted: graphView.center()
+
     Qan.GraphView {
         id: graphView
         anchors.fill: parent
diff --git a/src/qanNavigable.cpp b/src/qanNavigable.cpp
index 4a30cef2..add34568 100644
--- a/src/qanNavigable.cpp
+++ b/src/qanNavigable.cpp
@@ -107,7 +107,6 @@ void    Navigable::updateVirtualBr(const QRectF& containerChildrenRect)
     bool growTop = containerChildrenRect.top() < virtualBr.top();
     bool growBottom = containerChildrenRect.bottom() > virtualBr.bottom();
     auto newVirtualBr = virtualBr.united(containerChildrenRect);
-    // FIXME #244 use virtualBorder configuraiton here !
     newVirtualBr.adjust(growLeft ? -50 : 0.,
                         growTop ? -50 : 0.,
                         growRight ? 50 : 0.,
@@ -129,6 +128,19 @@ void    Navigable::setViewRect(const QRectF& viewRect)
     }
 }
 
+void    Navigable::center() {
+    const QRectF content = _containerItem->childrenRect();
+    if (content.isEmpty())
+        return;
+    _zoom = 1.0;
+    _containerItem->setScale(1.0);
+    const auto scale = 1.0;
+    const auto graphCenter = content.center();
+    const auto viewCenter = QPointF{width() / 2., height() / 2.0};
+    const auto topLeft = -(graphCenter * scale) - (viewCenter * scale);
+    _containerItem->setPosition(-topLeft);
+    emit navigated();
+}
 
 void    Navigable::centerOn(QQuickItem* item)
 {
@@ -177,9 +189,10 @@ void    Navigable::centerOnPosition(QPointF position)
     const QPointF navigableCenter{width() / 2., height() / 2.};
     const QPointF navigableCenterContainerCs = mapToItem(_containerItem, navigableCenter);
     const QPointF translation{navigableCenterContainerCs - position};
-
     const qreal zoom = _containerItem->scale();
+    // FIXME: Affreux
     const auto containerPosition = _containerItem->position() + (translation * zoom);
+
     if (containerPosition != _containerItem->position()) {      // fuzzy compare
         _containerItem->setPosition(containerPosition);
         updateGrid();
@@ -202,9 +215,9 @@ void    Navigable::moveTo(QPointF position)
 
 void    Navigable::fitContentInView(qreal forceWidth, qreal forceHeight)
 {
-    //qWarning() << "qan::Navigable::fitContentInView(): forceWidth=" << forceWidth << " forceHeight=" << forceHeight;
-    QRectF content = _containerItem->childrenRect();
-    //qWarning() << "  content=" << content;
+    qWarning() << "qan::Navigable::fitContentInView(): forceWidth=" << forceWidth << " forceHeight=" << forceHeight;
+    const QRectF content = _containerItem->childrenRect();
+    qWarning() << "  content=" << content;
     if (!content.isEmpty()) { // Protect against div/0, can't fit if there is no content...
         const qreal viewWidth = forceWidth > 0. ? forceWidth : width();
         const qreal viewHeight = forceHeight > 0. ? forceHeight : height();
diff --git a/src/qanNavigable.h b/src/qanNavigable.h
index 62387c53..b6cbe58b 100644
--- a/src/qanNavigable.h
+++ b/src/qanNavigable.h
@@ -180,6 +180,9 @@ protected slots:
     void            viewRectChanged();
 
 public:
+    //! Center the view on graph content center and set a 1.0 zoom.
+    Q_INVOKABLE void    center();
+
     //! Center the view on a given child item (zoom level is not modified).
     Q_INVOKABLE void    centerOn(QQuickItem* item);