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A channel is one of several sound sources that are mixed together by the sound card, and are represented in Pygame by Channel objects. The play method of Sound objects returns a Channel object for the channel that will play the sound, or None if all channels are busy playing. You can retrieve the number of available channels by calling the pygame.mixer.get_num_channels function. If you find that you don t have enough channels to play all the sounds you need to, you can create more by calling the pygame.mixer.set_num_channels function. If you just want the sound to play all the way through at full volume, you can safely ignore the return value of Sound.play. Otherwise, there are some useful effects you can create with the methods of Channel objects. One of the most useful is the ability to set the volume of the left and right speakers independently, which can be used to create the illusion that a sound is coming from a particular point on the screen an effect known as stereo panning. The set_volume method of Channel objects can take two parameters: the volume of the left speaker and the volume of the right speaker, both as a value between 0 and 1. Listing 10-1 shows a function that calculates the volume of the speakers given the x coordinate of the sound-producing event and the width of the screen. The further away the x coordinate is from the speaker, the lower the

Tip Instead of responding to a button click, you can respond immediately when the selection changes by

private void btnXMLReader_Click(object sender, EventArgs e)

In this example, each cell is treated individually and identified with a column and row index number. You can retrieve information about the cell field or row by retrieving the corresponding DataGridViewColumn or DataGridViewRow object from the DataGridView. For example, here s how you restrict the display to selected cell values that are in the column corresponding to the ProductID field: For Each cell As DataGridViewCell In DataGridView.SelectedCells If DataGridView.Columns(cell.ColumnIndex).Name = "ProductID" Then info.Append(cell.Value) info.Append(vbNewLine) End If Next In row selection mode, life is even easier. The DataGridViewRow object provides a Cells property that lets you retrieve individual cell values using the field name: For Each row As DataGridViewRow In DataGridView.SelectedRows info.Append(row.Cells("ProductID").Value) info.Append(vbNewLine) Next

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Remember, the SelectedRows collection is only filled when you select entire rows. Other selected cell and columns won t appear. It s just as easy to retrieve a reference to the current cell using the CurrentCell or CurrentCellAddress properties. When using the DataGridView, you ll notice that the current cell is surrounded by a focus rectangle, which looks like a black dotted square. This is the location where the user is currently positioned. Here s the code you need to add to display the current cell information: If dataGridView1.CurrentCell IsNot Nothing Then info.Append(String.Format("Current Cell Value: {0}", _ dataGridView1.CurrentCell.Value)) info.Append(vbNewLine) info.Append(String.Format("Current Cell Location: ({0}, {1})", _ dataGridView1.CurrentCellAddress.X, dataGridView1.CurrentCellAddress.Y)) End If The CurrentCellAddress property is read-only, but you can use CurrentCell to programmatically change the current location. Once you do, the DataGridView is scrolled so that the current location is visible. ' Move to the fourth cell in the eleventh row. DataGridView.CurrentCell = DataGridView.Rows(10).Cells(3) You also can scroll the DataGridView by setting the DataGridView.FirstDisplayedCell property with the index number of the row that should be positioned at the top of the display.

{ string _connstring = "Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;";

volume will be, so as a point moves across the screen from left to right, the left speaker will decrease in volume, while the right speaker will increase in volume. Listing 10-1. Function That Calculates Stereo Panning def stereo_pan(x_coord, screen_width): right_volume = float(x_coord) / screen_width left_volume = 1.0 - right_volume return (left_volume, right_volume) Listing 10-2 shows how you might use the stereo_pan function to play a sound effect for an exploding tank. Figure 10-4 shows how the position of the explosion relates to the values for the left and right channels.

Tip To programmatically change the selection in a grid, you can modify the Selected property of a DataGridViewCell, DataGridViewRow, or DataGridViewColumn. The DataGridView itself also exposes SelectAll() and ClearSelection() methods for quickly selecting and deselecting the entire table without needing to iterate over each cell.

It s worth considering some of the limitations of cell selection with the DataGridView. Most significantly, if you enumerate over the SelectedCells property, you ll wind up unsharing all the rows you touch. In fact, it s best to avoid cell selection altogether, if you can, and use row selection or column selection instead. Finally, you can check if the user has selected the entire grid (typically by clicking the box in the top-right corner) by calling the DataGridView. AreAllCellsSelectedMethod(). Use this method before you enumerate over a collection of rows, columns, or cells, to prevent needlessly unsharing rows.

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