计算器应用程序中的单元格包含文本字段和按钮部件。
The cells within our calculator application contain text-field and button widgets.
您可以使用键盘输入这些表达式，然后观察expr的工作，现在您已经有了足够的知识来修改该计算器代码，以添加支持这些函数的按钮。
You can use the keyboard to type these in and see expr work; and you should have enough knowledge now to modify the calculator code to add buttons that support these functions.
创建计算器的GUI，为其呈现布局和按钮。
Creates the GUI for the calculator, rendering the layout and the buttons for it.
这个计算器可以对通过键盘或GUI按钮输入的表达式进行计算。
The calculator evaluates expressions typed in from either the keyboard or the GUI buttons.
一旦你做到这一点，你会看到更多的按钮和控制计算器。
Once you do this, you'll see more buttons and controls on the calculator .
一旦你做到这一点，你会看到更多的按钮和控制计算器。
Once you do this, you'll see more buttons and controls on the calculator.
用户也有能力打开，使一个小弹出提示框出现的鼠标光标是在计算器上的按钮移动面对一个'提示'功能。
The user also has the ability to turn a 'hint' feature on so that a small pop-up hint box appears as the mouse cursor is moved over the buttons on the calculator face.
的计算器的确定按钮后，现在可以正确地使标签完成。
Calculator's OK button now correctly enables after TAB completion.
的计算器的确定按钮后，现在可以正确地使标签完成。
Calculator's OK button now correctly enables after TAB completion.
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