如何从 Pymel LayoutDialog 中获得用户选择？

Question

以下代码取自此处的 Pymel 文档：https://help.autodesk.com/cloudhelp/2020/ENU/Maya-Tech-Docs/PyMel/generated/functions/pymel.core.windows/pymel.core.windows.layoutDialog.html

虽然该示例名为checkboxPrompt，但它并未显示如何检索复选框的状态。 pm.layoutDialog 函数仅返回用于关闭对话框的按钮选择。同一命令的 MEL 和 Maya.cmds 文档也没有对此进行解释。那么它是如何实现的呢？

 
import pymel.core as pm

def checkboxPrompt():
    # Get the dialog's formLayout.
    #
    form = pm.setParent(q=True)

    # layoutDialog's are not resizable, so hard code a size here,
    # to make sure all UI elements are visible.
    #
    pm.formLayout(form, e=True, width=300)

    t = pm.text(l='What do you want to do?')

    b1 = pm.button(l='Abort', c='pm.layoutDialog( dismiss="Abort" )' )
    b2 = pm.button(l='Skip', c='pm.layoutDialog( dismiss="Skip" )' )
    b3 = pm.button(l='Continue', c='pm.layoutDialog( dismiss="Continue" )' )

    cb1 = pm.checkBox(label='Remember my choice')

    spacer = 5
    top = 5
    edge = 5

    pm.formLayout(form, edit=True,
                  attachForm=[(t, 'top', top), (t, 'left', edge), (t, 'right', edge), (b1, 'left', edge), (b3, 'right', edge), (cb1, 'left', edge), (cb1, 'bottom', spacer)],
                  attachNone=[(t, 'bottom'), (b1, 'bottom'), (b2, 'bottom'), (b3, 'bottom'), (cb1, 'right')],
                  attachControl=[(b1, 'top', spacer, t), (b2, 'top', spacer, t), (b3, 'top', spacer, t), (cb1, 'top', spacer, b1)],
                  attachPosition=[(b1, 'right', spacer, 33), (b2, 'left', spacer, 33), (b2, 'right', spacer, 66), (b3, 'left', spacer, 66)])

print pm.layoutDialog(ui=checkboxPrompt)

Answer 1

很多时候，文档会跳过很多元素以保持一定的简单性，但正因为如此，我们经常发现自己没有解决方案和/或非常基本的示例。

在您的情况下，有多种方法可以获取复选框值，例如：

• 在带有参数changeCommand 或onCommand / offCommand 的复选框上添加callback 以更新您之前在代码中创建的python global 变量。
• 更简单的方法是将lambda 函数设置为command 参数（而不是字符串）以检索复选框值并设置正确的dismiss 值。

这是我上面所说的第二种方法的代码：

import pymel.core as pm

def checkboxPrompt():
    # Get the dialog's formLayout.
    form = pm.setParent(q=True)
    
    # Function method to query the value of the checkbox
    def getRememberMyChoice(checkbox_id):
        if pm.checkBox(checkbox_id, query=True, value=True):
            return ':Yes'
        return ':No'

    # layoutDialog's are not resizable, so hard code a size here,
    # to make sure all UI elements are visible.
    pm.formLayout(form, e=True, width=300)

    t = pm.text(l='What do you want to do?')

    b1 = pm.button(l='Abort', c=lambda *args: pm.layoutDialog( dismiss="Abort"+getRememberMyChoice(checkbox1) ) )
    b2 = pm.button(l='Skip', c=lambda *args: pm.layoutDialog( dismiss="Skip"+getRememberMyChoice(checkbox1) ) )
    b3 = pm.button(l='Continue', c=lambda *args: pm.layoutDialog( dismiss="Continue"+getRememberMyChoice(checkbox1) ) )
 
    checkbox1 = pm.checkBox(label='Remember my choice')

    spacer = 5
    top = 5
    edge = 5

    pm.formLayout(form, edit=True,
                  attachForm=[(t, 'top', top), (t, 'left', edge), (t, 'right', edge), (b1, 'left', edge), (b3, 'right', edge), (checkbox1, 'left', edge), (checkbox1, 'bottom', spacer)],
                  attachNone=[(t, 'bottom'), (b1, 'bottom'), (b2, 'bottom'), (b3, 'bottom'), (checkbox1, 'right')],
                  attachControl=[(b1, 'top', spacer, t), (b2, 'top', spacer, t), (b3, 'top', spacer, t), (checkbox1, 'top', spacer, b1)],
                  attachPosition=[(b1, 'right', spacer, 33), (b2, 'left', spacer, 33), (b2, 'right', spacer, 66), (b3, 'left', spacer, 66)])

print (pm.layoutDialog(ui=checkboxPrompt))

执行代码，（选中或不选中复选框）然后通过单击其中一个按钮关闭将打印您：

# First word ("Continue") depends on the button you clicked
# Yes or No (after the ":") is the state of the "Remember my choice" checkbox 
Continue:Yes