139 lines
7.2 KiB
Markdown
139 lines
7.2 KiB
Markdown
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# wxPython:如何获取网格中选定的单元格
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> 原文：<https://www.blog.pythonlibrary.org/2013/10/31/wxpython-how-to-get-selected-cells-in-a-grid/>
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[](https://www.blog.pythonlibrary.org/wp-content/uploads/2013/10/wxgridselect.png)
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今天我们将看看如何从 wxPython 网格对象中获取选定的单元格。大多数情况下，获取节很容易，但是当用户选择多个单元格时，获取选择就变得复杂了。我们将需要创建一些示例代码来显示所有这些是如何组合在一起的。我们开始吧！
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### 网格单元选择
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网上有一篇关于这个话题的有趣文章。这里可以看[。然而，这篇文章有几个问题，我们也将看到。下面是我们要看的代码:](http://ginstrom.com/scribbles/2008/09/07/getting-the-selected-cells-from-a-wxpython-grid/)
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```py
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import wx
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import wx.grid as gridlib
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########################################################################
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class MyPanel(wx.Panel):
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""""""
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#----------------------------------------------------------------------
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def __init__(self, parent):
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"""Constructor"""
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wx.Panel.__init__(self, parent)
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self.currentlySelectedCell = (0, 0)
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self.myGrid = gridlib.Grid(self)
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self.myGrid.CreateGrid(12, 8)
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self.myGrid.Bind(gridlib.EVT_GRID_SELECT_CELL, self.onSingleSelect)
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self.myGrid.Bind(gridlib.EVT_GRID_RANGE_SELECT, self.onDragSelection)
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selectBtn = wx.Button(self, label="Get Selected Cells")
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selectBtn.Bind(wx.EVT_BUTTON, self.onGetSelection)
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sizer = wx.BoxSizer(wx.VERTICAL)
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sizer.Add(self.myGrid, 1, wx.EXPAND)
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sizer.Add(selectBtn, 0, wx.ALL|wx.CENTER, 5)
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self.SetSizer(sizer)
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#----------------------------------------------------------------------
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def onDragSelection(self, event):
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"""
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Gets the cells that are selected by holding the left
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mouse button down and dragging
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"""
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if self.myGrid.GetSelectionBlockTopLeft():
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top_left = self.myGrid.GetSelectionBlockTopLeft()[0]
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bottom_right = self.myGrid.GetSelectionBlockBottomRight()[0]
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self.printSelectedCells(top_left, bottom_right)
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#----------------------------------------------------------------------
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def onGetSelection(self, event):
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"""
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Get whatever cells are currently selected
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"""
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cells = self.myGrid.GetSelectedCells()
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if not cells:
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if self.myGrid.GetSelectionBlockTopLeft():
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top_left = self.myGrid.GetSelectionBlockTopLeft()[0]
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bottom_right = self.myGrid.GetSelectionBlockBottomRight()[0]
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self.printSelectedCells(top_left, bottom_right)
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else:
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print self.currentlySelectedCell
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else:
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print cells
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#----------------------------------------------------------------------
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def onSingleSelect(self, event):
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"""
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Get the selection of a single cell by clicking or
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moving the selection with the arrow keys
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"""
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print "You selected Row %s, Col %s" % (event.GetRow(),
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event.GetCol())
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self.currentlySelectedCell = (event.GetRow(),
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event.GetCol())
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event.Skip()
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#----------------------------------------------------------------------
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def printSelectedCells(self, top_left, bottom_right):
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"""
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Based on code from http://ginstrom.com/scribbles/2008/09/07/getting-the-selected-cells-from-a-wxpython-grid/
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"""
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cells = []
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rows_start = top_left[0]
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rows_end = bottom_right[0]
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cols_start = top_left[1]
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cols_end = bottom_right[1]
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rows = range(rows_start, rows_end+1)
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cols = range(cols_start, cols_end+1)
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cells.extend([(row, col)
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for row in rows
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for col in cols])
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print "You selected the following cells: ", cells
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for cell in cells:
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row, col = cell
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print self.myGrid.GetCellValue(row, col)
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########################################################################
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class MyFrame(wx.Frame):
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""""""
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#----------------------------------------------------------------------
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def __init__(self):
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"""Constructor"""
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wx.Frame.__init__(self, parent=None, title="Single Cell Selection")
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panel = MyPanel(self)
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self.Show()
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#----------------------------------------------------------------------
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if __name__ == "__main__":
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app = wx.App(False)
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frame = MyFrame()
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app.MainLoop()
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```
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让我们花点时间来分析一下。首先，我们创建一个网格对象，我们称之为 **self.myGrid** 。我们绑定到两个特定于网格的事件，EVT 网格选择单元格和 EVT 网格范围选择。这是为了演示的目的，因为你通常不需要绑定到 EVT 网格选择单元。对于单个单元格选择事件，我们调用 **onSingleSelect** 处理程序。在其中，我们使用事件对象来获取正确的行和列。如果你看上面链接的文章，你会注意到他们正在使用 GetGridCursorRow 和 GetGridCursorCol。我发现这些只返回**之前**选中的单元格，而不是当前选中的单元格。这就是我们使用事件对象的方法的原因。另请注意，我们正在更新**self . currently selected cell**的值，使其等于当前选择的单元格。
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另一个网格事件被绑定到 **onDragSelection** 。在这个事件处理程序中，我们调用网格的 **GetSelectionBlockTopLeft** ()方法，并检查以确保它返回一些东西。如果没有，那么我们什么也不做。但是如果它确实返回了一些东西，那么我们获取它的内容以及从 GetSelectionBlockBottomRight()返回的内容。然后我们将这些传递给我们的 **printSelectedCells** 方法。这段代码基于前面提到的文章，尽管它已经被简化了一点，因为我发现原来的 for 循环抛出了一个错误。基本上，这个方法所做的就是使用 Python 的 range 函数创建两个值列表。然后，它使用嵌套列表理解来扩展列表。最后，它打印出选择到 stdout 的单元格。
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最后要看的方法是按钮事件处理程序: **onGetSelection** 。这个方法调用网格的 **GetSelectedCells** ()方法。这将返回单击的选定单元格。如果用户拖动选择一些单元格，它也可以工作。如果用户只选择了一个单元格，那么我们将打印**self . currently selected cell**，因为它总是等于当前选择的值。
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### 包扎
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正如您所看到的，从 grid 对象中获取选定的一个或多个单元格可能有点棘手。但是通过一些努力，我们能够克服。希望您会发现这在您当前或未来的项目中很有用。
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### 相关阅读
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* wxPython: [网格简介](https://www.blog.pythonlibrary.org/2010/03/18/wxpython-an-introduction-to-grids/)
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* wxPython: [网格提示和技巧](https://www.blog.pythonlibrary.org/2010/04/04/wxpython-grid-tips-and-tricks/)
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* [从 wxPython 网格中获取选定的单元格](http://ginstrom.com/scribbles/2008/09/07/getting-the-selected-cells-from-a-wxpython-grid/)
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