pyqtgraph/graphicsItems/GraphicsLayout.py

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from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph.functions as fn
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from .GraphicsWidget import GraphicsWidget
## Must be imported at the end to avoid cyclic-dependency hell:
from .ViewBox import ViewBox
from .PlotItem import PlotItem
from .LabelItem import LabelItem
__all__ = ['GraphicsLayout']
class GraphicsLayout(GraphicsWidget):
"""
Used for laying out GraphicsWidgets in a grid.
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This is usually created automatically as part of a :class:`GraphicsWindow <pyqtgraph.GraphicsWindow>` or :class:`GraphicsLayoutWidget <pyqtgraph.GraphicsLayoutWidget>`.
"""
def __init__(self, parent=None, border=None):
GraphicsWidget.__init__(self, parent)
if border is True:
border = (100,100,100)
self.border = border
self.layout = QtGui.QGraphicsGridLayout()
self.setLayout(self.layout)
self.items = {} ## item: [(row, col), (row, col), ...] lists all cells occupied by the item
self.rows = {} ## row: {col1: item1, col2: item2, ...} maps cell location to item
self.currentRow = 0
self.currentCol = 0
self.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding))
#def resizeEvent(self, ev):
#ret = GraphicsWidget.resizeEvent(self, ev)
#print self.pos(), self.mapToDevice(self.rect().topLeft())
#return ret
def nextRow(self):
"""Advance to next row for automatic item placement"""
self.currentRow += 1
self.currentCol = -1
self.nextColumn()
def nextColumn(self):
"""Advance to next available column
(generally only for internal use--called by addItem)"""
self.currentCol += 1
while self.getItem(self.currentRow, self.currentCol) is not None:
self.currentCol += 1
def nextCol(self, *args, **kargs):
"""Alias of nextColumn"""
return self.nextColumn(*args, **kargs)
def addPlot(self, row=None, col=None, rowspan=1, colspan=1, **kargs):
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"""
Create a PlotItem and place it in the next available cell (or in the cell specified)
All extra keyword arguments are passed to :func:`PlotItem.__init__ <pyqtgraph.PlotItem.__init__>`
Returns the created item.
"""
plot = PlotItem(**kargs)
self.addItem(plot, row, col, rowspan, colspan)
return plot
def addViewBox(self, row=None, col=None, rowspan=1, colspan=1, **kargs):
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"""
Create a ViewBox and place it in the next available cell (or in the cell specified)
All extra keyword arguments are passed to :func:`ViewBox.__init__ <pyqtgraph.ViewBox.__init__>`
Returns the created item.
"""
vb = ViewBox(**kargs)
self.addItem(vb, row, col, rowspan, colspan)
return vb
def addLabel(self, text=' ', row=None, col=None, rowspan=1, colspan=1, **kargs):
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"""
Create a LabelItem with *text* and place it in the next available cell (or in the cell specified)
All extra keyword arguments are passed to :func:`LabelItem.__init__ <pyqtgraph.LabelItem.__init__>`
Returns the created item.
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To create a vertical label, use *angle* = -90.
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"""
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text = LabelItem(text, **kargs)
self.addItem(text, row, col, rowspan, colspan)
return text
def addLayout(self, row=None, col=None, rowspan=1, colspan=1, **kargs):
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"""
Create an empty GraphicsLayout and place it in the next available cell (or in the cell specified)
All extra keyword arguments are passed to :func:`GraphicsLayout.__init__ <pyqtgraph.GraphicsLayout.__init__>`
Returns the created item.
"""
layout = GraphicsLayout(**kargs)
self.addItem(layout, row, col, rowspan, colspan)
return layout
def addItem(self, item, row=None, col=None, rowspan=1, colspan=1):
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"""
Add an item to the layout and place it in the next available cell (or in the cell specified).
The item must be an instance of a QGraphicsWidget subclass.
"""
if row is None:
row = self.currentRow
if col is None:
col = self.currentCol
self.items[item] = []
for i in range(rowspan):
for j in range(colspan):
row2 = row + i
col2 = col + j
if row2 not in self.rows:
self.rows[row2] = {}
self.rows[row2][col2] = item
self.items[item].append((row2, col2))
self.layout.addItem(item, row, col, rowspan, colspan)
self.nextColumn()
def getItem(self, row, col):
"""Return the item in (*row*, *col*). If the cell is empty, return None."""
return self.rows.get(row, {}).get(col, None)
def boundingRect(self):
return self.rect()
def paint(self, p, *args):
if self.border is None:
return
p.setPen(fn.mkPen(self.border))
for i in self.items:
r = i.mapRectToParent(i.boundingRect())
p.drawRect(r)
def itemIndex(self, item):
for i in range(self.layout.count()):
if self.layout.itemAt(i).graphicsItem() is item:
return i
raise Exception("Could not determine index of item " + str(item))
def removeItem(self, item):
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"""Remove *item* from the layout."""
ind = self.itemIndex(item)
self.layout.removeAt(ind)
self.scene().removeItem(item)
for r,c in self.items[item]:
del self.rows[r][c]
del self.items[item]
self.update()
def clear(self):
items = []
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for i in list(self.items.keys()):
self.removeItem(i)