C++BUILDER OnVirtualKeyboardShown 和 OnVirtualKeyboardHidden 从另一种形式触发

Question

我在 C++Builder Tokyo 10.2 中有一个移动项目（Android 和 IOS）。它有 3 种形式（还），并且它们都有一些 TEdits。每个表单都有自己的 'FormVirtualKeyboardShown' 和 'FormVirtualKeyboardHidden' 函数。我在每个（FormVirtualKeyboardShown 函数）中都有一个 'Focused->GetObject()' 来获取哪个 TEdit 是焦点。

问题是：所有 'FormVirtualKeyboardShown' 函数都在触发，无论调用哪个表单。我尝试更改 .CPP、.H 和 .FMX 文件中的函数名称，使函数名称对我的所有项目都是唯一的。但仍然没有工作。它以所有形式调用所有函数。

因此，我在包含 dynamic_cast 代码的行中收到一条错误消息。

---------------------------
Debugger Exception Notification
---------------------------
Project Project1.apk raised exception class Segmentation fault (11).

它试图从另一个表单获取 TEdit，然后出现错误。我是 FMX 的新手，我从来没有见过这样的东西。这是我的部分代码：

Unit1.cpp

void __fastcall TForm1::FormVirtualKeyboardShown(TObject *Sender, bool KeyboardVisible,const TRect &Bounds)
{
    int num;
    TControl * LFocused = dynamic_cast<TControl*>(Focused->GetObject());
    num = LFocused->ComponentIndex;
    ShowMessage("Index of TEdit from Form ONE is "+ IntToStr(num));
}

Unit2.cpp

void __fastcall TForm2::FormVirtualKeyboardShown(TObject *Sender, bool KeyboardVisible,const TRect &Bounds)
{
    int num;
    TControl * LFocused = dynamic_cast<TControl*>(Focused->GetObject());
    num = LFocused->ComponentIndex;
    ShowMessage("Index of TEdit from Form TWO is "+ IntToStr(num));
}

Unit3.cpp

void __fastcall TForm3::FormVirtualKeyboardShown(TObject *Sender, bool KeyboardVisible,const TRect &Bounds)
{
    int num;
    TControl * LFocused = dynamic_cast<TControl*>(Focused->GetObject());
    num = LFocused->ComponentIndex;
    ShowMessage("Index of TEdit from Form THREE is "+ IntToStr(num));
}

我的观点是：我需要确切地知道哪个 TEdit 是 Focus。所以我可以正确地采取行动。

我是否只需要在 Unit1.cpp (Form1) 中创建这些功能（FormVirtualKeyboardShown 和 FormVirtualKeyboardHidden）？因此，所有其他形式的 TEdits 都会触发 Form1 中的这些功能。如果是这样...我如何确定哪个 TEdit 具有焦点？来自任何表格???

我正在使用 C++Builder 10.2 Tokyo 25.0.26309.314

请大家帮帮我！谢谢！

Answer 1

我无法评论为什么多个表单会同时触发相同的 VirtualKeyboard 事件。对我来说，这听起来像是 FireMonkey 中的一个错误。除非 KeyboardVisible 参数仅在一个事件中为 true 而在其他两个事件中为 false，这将是一个奇怪的设计选择。

但即便如此，这应该很容易解决，例如：

Unit1.cpp

void __fastcall TForm1::FormVirtualKeyboardShown(TObject *Sender, bool KeyboardVisible, const TRect &Bounds)
{
    if (!KeyboardVisible) return;
    _di_IControl ctrl = Focused;
    if (!ctrl) return;
    if (Screen->FocusControl != ctrl) return;
    TControl * LFocused = static_cast<TControl*>(ctrl->GetObject());
    int num = LFocused->ComponentIndex;
    ShowMessage("Index of TEdit from Form ONE is " + IntToStr(num));
}

Unit2.cpp

void __fastcall TForm2::FormVirtualKeyboardShown(TObject *Sender, bool KeyboardVisible,const TRect &Bounds)
{
    if (!KeyboardVisible) return;
    _di_IControl ctrl = Focused;
    if (!ctrl) return;
    if (Screen->FocusControl != ctrl) return;
    TControl * LFocused = static_cast<TControl*>(ctrl->GetObject());
    int num = LFocused->ComponentIndex;
    ShowMessage("Index of TEdit from Form TWO is " + IntToStr(num));
}

Unit3.cpp

void __fastcall TForm3::FormVirtualKeyboardShown(TObject *Sender, bool KeyboardVisible,const TRect &Bounds)
{
    if (!KeyboardVisible) return;
    _di_IControl ctrl = Focused;
    if (!ctrl) return;
    if (Screen->FocusControl != ctrl) return;
    TControl * LFocused = static_cast<TControl*>(ctrl->GetObject());
    int num = LFocused->ComponentIndex;
    ShowMessage("Index of TEdit from Form THREE is " + IntToStr(num));
}

C++BUILDER OnVirtualKeyboardShown 和 OnVirtualKeyboardHidden 从另一种形式触发

C++BUILDER OnVirtualKeyboardShown and OnVirtualKeyboardHidden firing from another form

c++

android

c++builder