void KNMusicAlbumView::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event)
//Initial the painter.
QPainter painter(viewport());
painter.setRenderHints(QPainter::Antialiasing |
QPainter::TextAntialiasing |
QPainter::SmoothPixmapTransform,
true);
//Get the option view item.
QStyleOptionViewItem option=viewOptions();
//Check if we need to paint the background.
if(autoFillBackground())
{
painter.fillRect(rect(), option.palette.base());
}
//Update the parameters of the view first.
updateParameters();
//Check the model first.
if(m_proxyModel==nullptr)
{
return;
}
//Get the row count.
int albumCount=m_proxyModel->rowCount();
//Calculate the line count.
m_lineCount=(albumCount+m_maxColumnCount-1)/m_maxColumnCount;
//Check the album count first.
if(albumCount==0)
{
return;
}
int currentColumn=0,
currentLeft=m_spacing,
currentLine=verticalScrollBar()->value()/m_itemSpacingHeight, //Skip the before.
currentTop=m_spacing+currentLine*m_itemSpacingHeight,
currentRow=currentLine*m_maxColumnCount,
heightSurplus=height()+m_itemSpacingHeight;
//Change the origin of coordinate.
painter.translate(0, -verticalScrollBar()->value());
//Draw all the albums.
while(currentRow < albumCount && heightSurplus > 0)
{
//Get the source index of the item.
QModelIndex proxyIndex=m_proxyModel->index(currentRow, 0);
//If the source index is not the current index, then draw the album.
if(m_proxyModel->mapToSource(proxyIndex)!=m_selectedIndex)
{
paintAlbum(painter,
QPoint(currentLeft, currentTop),
proxyIndex);
}
//Add current row and column.
currentRow++;
currentColumn++;
//Check if we need to move to next row.
if(currentColumn>=m_maxColumnCount)
{
//Add one line.
currentLine++;
//Reset the column.
currentColumn=0;
//Change the position.
currentLeft=m_spacing;
currentTop+=m_itemSpacingHeight;
heightSurplus-=m_itemSpacingHeight;
}
else
{
//Move to next column position.
currentLeft+=m_itemSpacingWidth;
}
}
//Update the scroll bar value.
updateGeometries();
}
void KNMusicAlbumView::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event)
//Initial the painter.
QPainter painter(viewport());
painter.setRenderHints(QPainter::Antialiasing |
QPainter::TextAntialiasing |
QPainter::SmoothPixmapTransform,
true);
//Check if we need to paint the background.
if(autoFillBackground())
{
painter.fillRect(rect(), viewOptions().palette.base());
}
//Check the model first.
if(m_proxyModel==nullptr)
{
return;
}
//Get the row count.
int albumCount=m_proxyModel->rowCount();
//Check the album count first.
if(albumCount==0)
{
return;
}
//Calculate the line count.
m_lineCount=(albumCount+m_maxColumnCount-1)/m_maxColumnCount;
//Generate the parameters.
int currentColumn=0,
currentLeft=m_spacing,
currentLine=verticalScrollBar()->value()/m_itemSpacingHeight,
currentTop=m_spacing+currentLine*m_itemSpacingHeight,
currentRow=currentLine*m_maxColumnCount,
heightSurplus=height()+m_itemSpacingHeight;
/*
* currentColumn
* |
* +-------------------------------------------------+
* | +---+ +---+ +---+ +---+ +---+ +---+ +---+ +---+ |
* | | | | | | | | | | | | | | | | | |
* | +---+ +---+ +---+ +---+ +---+ +---+ +---+ +---+ |
* | |
* | +---+ +---+ xxxxx-currentTop |
* | | | | | xxxxx | - currentLine
* | +---+ +---+ xxxxx |
* | | | | -+
* | currentLeft-+ | | |
* | +--QModelIndex(25252, 0) | |
* | | | |
* | currentRow | +-heightSurplus
* | | |
* | | |
* | | |
* +-------------------------------------------------+ -+
*/
//Change the origin of coordinate.
painter.translate(0, -verticalScrollBar()->value());
//Draw all the albums, until there's no album left, no height surplus.
while(currentRow < albumCount && heightSurplus > 0)
{
//Get the source index of the item.
QModelIndex &&proxyIndex=m_proxyModel->index(currentRow, 0);
//If the source index is not the current index, then draw the album.
if(m_proxyModel->mapToSource(proxyIndex)!=m_selectedIndex)
{
//Draw the unselect album.
paintAlbum(painter, currentLeft, currentTop, proxyIndex);
}
//Add current row to the next album model row.
++currentRow;
//Add current column to the next position.
++currentColumn;
//Check if we need to move to next row.
if(currentColumn>=m_maxColumnCount)
{
//Add current line.
++currentLine;
//Reset the column.
currentColumn=0;
//Change the position.
currentLeft=m_spacing;
currentTop+=m_itemSpacingHeight;
heightSurplus-=m_itemSpacingHeight;
}
else
{
//Move to next column position.
currentLeft+=m_itemSpacingWidth;
}
}
//Update the scroll bar value.
updateGeometries();
}
