如何在C ++ Builder中通过单个函数更改10 Edit控件的颜色

Question

我想在进入编辑时以及从编辑退出时更改编辑控件的颜色，我想通过单个功能做到这一点，我不想在输入事件或退出事件中为每次编辑添加代码

Answer 1

yes like David and kobik said you just need to create event handlers for OnEnter and OnExit and assign the controls you wish to use them

for example

Add two TEdit's to your form and in the constructor of the form do the following

__fastcall TTestForm::TTestForm(TComponent* Owner)
    : TForm(Owner)
{
    Edit1->OnEnter = EditEnter;
    Edit2->OnEnter = EditEnter;

    Edit1->OnExit = EditExit;
    Edit2->OnExit = EditExit;
}

Now Create the Enter and Exit event handlers like so

void __fastcall TTestForm::EditEnter(TObject *Sender)
{
    TEdit *Temp = (TEdit*)Sender;
    Temp->Color = clRed;
}

void __fastcall TTestForm::EditExit(TObject *Sender)
{
    TEdit *Temp = (TEdit*)Sender;
    Temp->Color = clGreen;
}

Thats it.

Answer 2

Write OnEnter and OnExit event handlers and assign them to each control. Use the Sender parameter to the event to identify which control the event applies to.