HG_REPOSITORIES/LPP/INSTRUMENTATION/USERS/JEANDET/qtcharts Commit - r1446:f8259d05b01f

fixed legend scrolling in detached mode. updated example

sauimone -

r1446:f8259d05b01f

parent child

Context file:

r1446:f8259d05b01f

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examples/legend/mainwidget.cpp +1 -1

                  m_legendHeight->setMinimum(0);
                  m_legendHeight->setMaximum(chartViewRect.height());
-                 m_legendHeight->setValue(64);
+                 m_legendHeight->setValue(75);
              }
              void MainWidget::hideLegendSpinbox()

src/legend/qlegend.cpp +36 -5

                      }
                  }
-                 // If detached, the scrolling and layout logic is inverted.
+                 // If detached, the scrolling direction is vertical instead of horizontal and vice versa.
                  if (!m_attachedToChart) {
                      scrollHorizontal = !scrollHorizontal;
                  }
+                 // Limit offset between m_minOffset and m_maxOffset
                  if (scrollHorizontal) {
                      if(m_width<=m_rect.width()) return;
                      if (x != m_offsetX) {
-                         m_offsetX = qBound(qreal(0), x, m_width - m_rect.width());
+                         m_offsetX = qBound(m_minOffsetX, x, m_maxOffsetX);
                          m_markers->setPos(-m_offsetX,m_rect.top());
                      }
                  } else {
                      if(m_height<=m_rect.height()) return;
                      if (y != m_offsetY) {
-                         m_offsetY = qBound(qreal(0), y, m_height - m_rect.height());
+                         m_offsetY = qBound(m_minOffsetY, y, m_maxOffsetY);
                          m_markers->setPos(m_rect.left(),-m_offsetY);
                      }
                  }
                      break;
                  }
+                 m_minOffsetX = 0;
+                 m_minOffsetY = 0;
+                 m_maxOffsetX = m_width - m_rect.width();
+                 m_maxOffsetY = m_height - m_rect.height();
                  m_presenter->updateLayout();
              }
              void QLegendPrivate::updateDetachedLayout()
              {
+                 // Detached layout is different.
+                 // In detached mode legend may have multiple rows and columns, so layout calculations
+                 // differ a log from attached mode.
+                 // Also the scrolling logic is bit different.
                  m_offsetX=0;
+                 m_offsetY=0;
                  QList<QGraphicsItem *> items = m_markers->childItems();
                  if(items.isEmpty()) return;
                          }
                          m_markers->setPos(m_rect.topLeft());
                          m_width = m_minWidth;
+                         m_minOffsetX = 0;
+                         m_minOffsetY = 0;
+                         m_maxOffsetX = m_width - m_rect.width();
+                         m_maxOffsetY = m_height - m_rect.height();
                      }
                      break;
                      case Qt::AlignBottom: {
                          }
                          m_markers->setPos(m_rect.topLeft());
                          m_width = m_minWidth;
+                         m_minOffsetX = 0;
+                         m_minOffsetY = qMin(m_rect.topLeft().y(), m_rect.topLeft().y() - m_height + m_rect.height());
+                         m_maxOffsetX = m_width - m_rect.width();
+                         m_maxOffsetY = 0;
                      }
                      break;
                      case Qt::AlignLeft: {
                              m_minWidth = qMax(m_minWidth,rect.width());
                              m_minHeight = qMax(m_minHeight,h);
                              maxWidth = qMax(maxWidth,w);
-                             m_width = qMax(m_width, maxWidth);
                              item->setPos(point.x(),point.y());
                              point.setY(point.y() + h);
                              if (point.y() + h > m_rect.topLeft().y() + m_rect.height()) {
                                  }
                              }
                          }
+                         m_width += maxWidth;
                          m_markers->setPos(m_rect.topLeft());
                          m_height = m_minHeight;
+                         m_minOffsetX = 0;
+                         m_minOffsetY = 0;
+                         m_maxOffsetX = m_width - m_rect.width();
+                         m_maxOffsetY = m_height - m_rect.height();
                      }
                      break;
                      case Qt::AlignRight: {
                              m_minWidth = qMax(m_minWidth,rect.width());
                              m_minHeight = qMax(m_minHeight,h);
                              maxWidth = qMax(maxWidth,w);
-                             m_width = qMax(m_width, maxWidth);
                              item->setPos(point.x() - w,point.y());
                              point.setY(point.y() + h);
                              if (point.y() + h > m_rect.topLeft().y() + m_rect.height()) {
                                  }
                              }
                          }
+                         m_width += maxWidth;
                          m_markers->setPos(m_rect.topLeft());
                          m_height = m_minHeight;
+                         m_minOffsetX = qMin(m_rect.topLeft().x(), m_rect.topLeft().x() - m_width + m_rect.width());
+                         m_minOffsetY = 0;
+                         m_maxOffsetX = 0;
+                         m_maxOffsetY = m_height - m_rect.height();
                      }
                      break;
                      default:

src/legend/qlegend_p.h +4 0

                  QRectF m_rect;
                  qreal m_offsetX;
                  qreal m_offsetY;
+                 qreal m_minOffsetX;
+                 qreal m_minOffsetY;
+                 qreal m_maxOffsetX;
+                 qreal m_maxOffsetY;
                  qreal m_minWidth;
                  qreal m_minHeight;
                  qreal m_width;

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