使用事件和委托在窗体之间传递数据 (C++/CLI)
3.91/5 (5投票s)
一个 Visual Studio 2015 项目，
引言
这个简单的项目包含一个主（父）窗体和两个子窗体。
主窗体向每个子窗体传递一个string。
每个子窗体向主窗体以及另一个子窗体传递一个string。
目前还不清楚如何直接从一个子窗体向另一个子窗体传递string。因此，我的解决方案是每个子窗体都将string传递给主窗体，然后主窗体再将string传递给另一个子窗体。
欢迎提供任何无需此中继机制的解决方案。
背景
我编程多年，但从未遇到过需要在窗体之间传递数据的需求，除非通过引用传递对象。
当我听说委托时，我搜索了简单的例子，但大多数例子都包含了多余的代码。
希望我的例子能帮助你理解基础知识。
Using the Code
**主窗体**包含对每个子窗体的引用
#include "ChildForm1.h"
#include "ChildForm2.h"
private: ChildForm1^ c1;
private: ChildForm2^ c2;
在主窗体的加载方法中，创建每个子窗体的对象
this->c1 = gcnew ChildForm1();
this->c2 = gcnew ChildForm2();
以下显示了如何将string直接从主窗体发送到每个子窗体——这里没有什么神奇之处——不需要委托。
每个子窗体中的SetTextBox方法必须声明为public
private: System::Void sendButton1(System::Object^ sender, System::EventArgs^ e)
{
this->c1->SetTextBox1(this->textBox3->Text);
}
private: System::Void sendButton2(System::Object^ sender, System::EventArgs^ e)
{
this->c2->SetTextBox1(this->textBox4->Text);
}
接下来，主窗体订阅（作为监听器）子窗体的“发送文本”发布事件
“+=”表示我们正在订阅。您可以随时使用“-=”取消订阅。
请注意，下面的第二个参数必须是主窗体事件处理程序的完整规范。不要忘记在命名空间前添加“&”（& + 命名空间 + 订阅者的窗体名称 + 订阅者的事件处理程序）。
我使用了4个监听器——2个用于从每个子窗体到父窗体的string，以及2个用于从每个子窗体到另一个子窗体的string（通过父窗体中转）。
// Events have only 2 args
this->c1->myEvent1 += gcnew ChildForm1::EventDelegate1
(this, &PassingDataBetweenForms::Form1::mySubscriber1a);
this->c1->myEvent2 += gcnew ChildForm1::EventDelegate2
(this, &PassingDataBetweenForms::Form1::mySubscriber1b);
this->c2->myEvent1 += gcnew ChildForm2::EventDelegate1
(this, &PassingDataBetweenForms::Form1::mySubscriber2a);
this->c2->myEvent2 += gcnew ChildForm2::EventDelegate2
(this, &PassingDataBetweenForms::Form1::mySubscriber2b);
以下是上面声明的主窗体的订阅者事件处理程序。当子窗体发布事件时，string将显示在目标窗体的TextBox中。
private: void mySubscriber1a
(System::Object^ sender, System::EventArgs^ e, String^ text) // From child form 1
{
this->textBox1->Text = text; // Here's where we display the message from child1 to parent
}
private: void mySubscriber1b
(System::Object^ sender, System::EventArgs^ e, String^ text) // From child form 1
{
this->c2->SetTextBox2(text); // Here's where we forward the message from child2 to child1
}
private: void mySubscriber2a
(System::Object^ sender, System::EventArgs^ e, String^ text) // From child form 2
{
this->textBox2->Text = text; // Here's where we display the message from child2 to parent
}
private: void mySubscriber2b
(System::Object^ sender, System::EventArgs^ e, String^ text) // From child form 2
{
this->c1->SetTextBox2(text); // Here's where we forward the message from child1 to child2
}
**子窗体**负责定义（public）委托和事件，以便发布供订阅者（主窗体）监听的string。
在这种情况下，一个事件将string发送给其父级，另一个事件将string发送给其兄弟（通过父级）。
// Publish an event (with a text message) that other forms can subscribe to
public: delegate void EventDelegate1(System::Object^ sender, System::EventArgs^ e, String^ message);
public: event EventDelegate1^ myEvent1;
public: delegate void EventDelegate2(System::Object^ sender, System::EventArgs^ e, String^ message);
public: event EventDelegate2^ myEvent2;
请注意，在任何子窗体中都没有#include（引用另一个子窗体），因为这将创建一个循环引用，无法编译。
因此，当单击子窗体的发送按钮时，它将触发其事件处理程序之一。
public: void issueEvent1(System::Object^ sender, System::EventArgs^ e) //This is where
//we publish the event to all subscribers
{
this->myEvent1(this, e, this->textBox3->Text); // Raise the event using the EventDelegate signature
}
public: void issueEvent2(System::Object^ sender, System::EventArgs^ e) //This is where
//we publish the event to all subscribers
{
this->myEvent2(this, e, this->textBox4->Text); // Raise the event using the EventDelegate signature
}
请注意，在这里我们添加string（要发布的）作为第三个参数，根据上面EventDelegate的声明。
我希望这个简单的例子能够帮助你解开事件、委托、发布者和订阅者的神秘面纱，就像它曾经帮助我一样。
主窗体
#pragma once
#include "Child Form 1.h"
#include "Child Form 2.h"
namespace PassingDataBetweenForms {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Collections::Generic;
using namespace System::Windows::Forms;
using namespace System::Drawing;
using namespace System::Text;
using namespace System::Diagnostics;
public ref class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
protected:
~Form1()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::Button^ button1;
private: System::Windows::Forms::Button^ button2;
private: System::Windows::Forms::TextBox^ textBox1;
private: System::Windows::Forms::TextBox^ textBox2;
private: System::Windows::Forms::Label^ label1;
private: System::Windows::Forms::Label^ label2;
private: System::Windows::Forms::Label^ label3;
private: System::Windows::Forms::Label^ label4;
private: System::Windows::Forms::TextBox^ textBox4;
private: System::Windows::Forms::TextBox^ textBox3;
private:
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
this->button1 = (gcnew System::Windows::Forms::Button());
this->button2 = (gcnew System::Windows::Forms::Button());
this->textBox1 = (gcnew System::Windows::Forms::TextBox());
this->textBox2 = (gcnew System::Windows::Forms::TextBox());
this->label1 = (gcnew System::Windows::Forms::Label());
this->label2 = (gcnew System::Windows::Forms::Label());
this->label3 = (gcnew System::Windows::Forms::Label());
this->label4 = (gcnew System::Windows::Forms::Label());
this->textBox4 = (gcnew System::Windows::Forms::TextBox());
this->textBox3 = (gcnew System::Windows::Forms::TextBox());
this->SuspendLayout();
//
// button1
//
this->button1->Location = System::Drawing::Point(30, 238);
this->button1->Name = L"button1";
this->button1->Size = System::Drawing::Size(127, 27);
this->button1->TabIndex = 0;
this->button1->Text = L"Send";
this->button1->UseVisualStyleBackColor = true;
this->button1->Click += gcnew System::EventHandler(this, &Form1::sendButton1);
//
// button2
//
this->button2->Location = System::Drawing::Point(173, 238);
this->button2->Name = L"button2";
this->button2->Size = System::Drawing::Size(127, 27);
this->button2->TabIndex = 1;
this->button2->Text = L"Send";
this->button2->UseVisualStyleBackColor = true;
this->button2->Click += gcnew System::EventHandler(this, &Form1::sendButton2);
//
// textBox1
//
this->textBox1->Location = System::Drawing::Point(30, 37);
this->textBox1->Multiline = true;
this->textBox1->Name = L"textBox1";
this->textBox1->Size = System::Drawing::Size(127, 79);
this->textBox1->TabIndex = 2;
//
// textBox2
//
this->textBox2->Location = System::Drawing::Point(173, 37);
this->textBox2->Multiline = true;
this->textBox2->Name = L"textBox2";
this->textBox2->Size = System::Drawing::Size(127, 79);
this->textBox2->TabIndex = 3;
//
// label1
//
this->label1->AutoSize = true;
this->label1->Location = System::Drawing::Point(40, 13);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(106, 17);
this->label1->TabIndex = 4;
this->label1->Text = L"Data From Child 1";
//
// label2
//
this->label2->AutoSize = true;
this->label2->Location = System::Drawing::Point(182, 13);
this->label2->Name = L"label2";
this->label2->Size = System::Drawing::Size(108, 17);
this->label2->TabIndex = 5;
this->label2->Text = L"Data From Child 2";
//
// label3
//
this->label3->AutoSize = true;
this->label3->Location = System::Drawing::Point(189, 121);
this->label3->Name = L"label3";
this->label3->Size = System::Drawing::Size(95, 17);
this->label3->TabIndex = 19;
this->label3->Text = L"Data To Child 2";
//
// label4
//
this->label4->AutoSize = true;
this->label4->Location = System::Drawing::Point(47, 121);
this->label4->Name = L"label4";
this->label4->Size = System::Drawing::Size(93, 17);
this->label4->TabIndex = 18;
this->label4->Text = L"Data To Child 1";
//
// textBox4
//
this->textBox4->Location = System::Drawing::Point(173, 145);
this->textBox4->Multiline = true;
this->textBox4->Name = L"textBox4";
this->textBox4->Size = System::Drawing::Size(127, 79);
this->textBox4->TabIndex = 17;
//
// textBox3
//
this->textBox3->Location = System::Drawing::Point(30, 145);
this->textBox3->Multiline = true;
this->textBox3->Name = L"textBox3";
this->textBox3->Size = System::Drawing::Size(127, 79);
this->textBox3->TabIndex = 16;
//
// Form1
//
this->AutoScaleDimensions = System::Drawing::SizeF(7, 17);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->BackColor = System::Drawing::Color::FromArgb
(static_cast<System::Int32>(static_cast<System::Byte>(182)),
static_cast<System::Int32>(static_cast<System::Byte>(200)),
static_cast<System::Int32>(static_cast<System::Byte>(200)));
this->ClientSize = System::Drawing::Size(331, 287);
this->Controls->Add(this->label3);
this->Controls->Add(this->label4);
this->Controls->Add(this->textBox4);
this->Controls->Add(this->textBox3);
this->Controls->Add(this->label2);
this->Controls->Add(this->label1);
this->Controls->Add(this->textBox2);
this->Controls->Add(this->textBox1);
this->Controls->Add(this->button2);
this->Controls->Add(this->button1);
this->Font = (gcnew System::Drawing::Font(L"Comic Sans MS", 9,
System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->FormBorderStyle = System::Windows::Forms::FormBorderStyle::FixedSingle;
this->Margin = System::Windows::Forms::Padding(3, 4, 3, 4);
this->MaximizeBox = false;
this->MinimizeBox = false;
this->Name = L"Form1";
this->Text = L"Parent Form";
this->Load += gcnew System::EventHandler(this, &Form1::load);
this->Shown += gcnew System::EventHandler(this, &Form1::shown);
this->ResumeLayout(false);
this->PerformLayout();
}
#pragma endregion
private: ChildForm1^ c1;
private: ChildForm2^ c2;
private: System::Void load(System::Object^ sender, System::EventArgs^ e) {
this->textBox3->Text = "hi child1 from parent";
this->textBox4->Text = "hi child2 from parent";
this->c1 = gcnew ChildForm1();
this->c2 = gcnew ChildForm2();
// The main form subscribes (as a listener) to the child form "send text"
// published events - these are the declarations for the event handlers shown below
this->c1->myEvent1 += gcnew ChildForm1::EventDelegate1
(this, &PassingDataBetweenForms::Form1::mySubscriber1a); // Events have only 2 args
this->c1->myEvent2 += gcnew ChildForm1::EventDelegate2
(this, &PassingDataBetweenForms::Form1::mySubscriber1b); // Events have only 2 args
this->c2->myEvent1 += gcnew ChildForm2::EventDelegate1
(this, &PassingDataBetweenForms::Form1::mySubscriber2a); // Events have only 2 args
this->c2->myEvent2 += gcnew ChildForm2::EventDelegate2
(this, &PassingDataBetweenForms::Form1::mySubscriber2b); // Events have only 2 args
}
private: System::Void shown(System::Object^ sender, System::EventArgs^ e) {
this->c1->Show();
this->c2->Show();
}
// The main form's subscriber event handlers which are declared above
private: void mySubscriber1a(System::Object^ sender,
System::EventArgs^ e, String^ text) // From child form 1
{
this->textBox1->Text = text; // Here's where we display the message from the child1
}
private: void mySubscriber1b(System::Object^ sender,
System::EventArgs^ e, String^ text) // From child form 1
{
this->c2->SetTextBox2(text); // Here's where we forward the message from child2 to child1
}
private: void mySubscriber2a(System::Object^ sender,
System::EventArgs^ e, String^ text) // From child form 2
{
this->textBox2->Text = text; // Here's where we display the message from the child2
}
private: void mySubscriber2b(System::Object^ sender,
System::EventArgs^ e, String^ text) // From child form 2
{
this->c1->SetTextBox2(text); // Here's where we forward the message from child1 to child2
}
private: System::Void sendButton1(System::Object^ sender, System::EventArgs^ e) {
this->c1->SetTextBox1(this->textBox3->Text);
}
private: System::Void sendButton2(System::Object^ sender, System::EventArgs^ e) {
this->c2->SetTextBox1(this->textBox4->Text);
}
};
}
子窗体 1
#pragma once
namespace PassingDataBetweenForms {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Collections::Generic;
using namespace System::Windows::Forms;
using namespace System::Drawing;
using namespace System::Text;
using namespace System::Diagnostics;
public ref class ChildForm1 : public System::Windows::Forms::Form
{
// Public events (using delegates) are declared here in order to publish strings
// for the subscriber (main form) who listens to these events
public: delegate void EventDelegate1(System::Object^ sender,
System::EventArgs^ e, String^ message); // Publish an event (with a text message)
// that others can subscribe to
public: event EventDelegate1^ myEvent1;
public: delegate void EventDelegate2(System::Object^ sender,
System::EventArgs^ e, String^ message); // Publish an event (with a text message)
// that others can subscribe to
public: event EventDelegate2^ myEvent2;
public:
ChildForm1(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
protected:
~ChildForm1()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::Label^ label3;
private: System::Windows::Forms::Label^ label4;
private: System::Windows::Forms::TextBox^ textBox4;
private: System::Windows::Forms::TextBox^ textBox3;
private: System::Windows::Forms::Label^ label2;
private: System::Windows::Forms::Label^ label1;
private: System::Windows::Forms::TextBox^ textBox2;
private: System::Windows::Forms::TextBox^ textBox1;
private: System::Windows::Forms::Button^ button2;
private: System::Windows::Forms::Button^ button1;
private:
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
this->label3 = (gcnew System::Windows::Forms::Label());
this->label4 = (gcnew System::Windows::Forms::Label());
this->textBox4 = (gcnew System::Windows::Forms::TextBox());
this->textBox3 = (gcnew System::Windows::Forms::TextBox());
this->label2 = (gcnew System::Windows::Forms::Label());
this->label1 = (gcnew System::Windows::Forms::Label());
this->textBox2 = (gcnew System::Windows::Forms::TextBox());
this->textBox1 = (gcnew System::Windows::Forms::TextBox());
this->button2 = (gcnew System::Windows::Forms::Button());
this->button1 = (gcnew System::Windows::Forms::Button());
this->SuspendLayout();
//
// label3
//
this->label3->AutoSize = true;
this->label3->Location = System::Drawing::Point(189, 121);
this->label3->Name = L"label3";
this->label3->Size = System::Drawing::Size(95, 17);
this->label3->TabIndex = 29;
this->label3->Text = L"Data To Sibling";
//
// label4
//
this->label4->AutoSize = true;
this->label4->Location = System::Drawing::Point(47, 121);
this->label4->Name = L"label4";
this->label4->Size = System::Drawing::Size(93, 17);
this->label4->TabIndex = 28;
this->label4->Text = L"Data To Parent";
//
// textBox4
//
this->textBox4->Location = System::Drawing::Point(173, 145);
this->textBox4->Multiline = true;
this->textBox4->Name = L"textBox4";
this->textBox4->Size = System::Drawing::Size(127, 79);
this->textBox4->TabIndex = 27;
//
// textBox3
//
this->textBox3->Location = System::Drawing::Point(30, 145);
this->textBox3->Multiline = true;
this->textBox3->Name = L"textBox3";
this->textBox3->Size = System::Drawing::Size(127, 79);
this->textBox3->TabIndex = 26;
//
// label2
//
this->label2->AutoSize = true;
this->label2->Location = System::Drawing::Point(182, 13);
this->label2->Name = L"label2";
this->label2->Size = System::Drawing::Size(108, 17);
this->label2->TabIndex = 25;
this->label2->Text = L"Data From Sibling";
//
// label1
//
this->label1->AutoSize = true;
this->label1->Location = System::Drawing::Point(40, 13);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(106, 17);
this->label1->TabIndex = 24;
this->label1->Text = L"Data From Parent";
//
// textBox2
//
this->textBox2->Location = System::Drawing::Point(173, 37);
this->textBox2->Multiline = true;
this->textBox2->Name = L"textBox2";
this->textBox2->Size = System::Drawing::Size(127, 79);
this->textBox2->TabIndex = 23;
//
// textBox1
//
this->textBox1->Location = System::Drawing::Point(30, 37);
this->textBox1->Multiline = true;
this->textBox1->Name = L"textBox1";
this->textBox1->Size = System::Drawing::Size(127, 79);
this->textBox1->TabIndex = 22;
//
// button2
//
this->button2->Location = System::Drawing::Point(173, 238);
this->button2->Name = L"button2";
this->button2->Size = System::Drawing::Size(127, 27);
this->button2->TabIndex = 21;
this->button2->Text = L"Send";
this->button2->UseVisualStyleBackColor = true;
this->button2->Click += gcnew System::EventHandler(this, &ChildForm1::sendButton2);
//
// button1
//
this->button1->Location = System::Drawing::Point(30, 238);
this->button1->Name = L"button1";
this->button1->Size = System::Drawing::Size(127, 27);
this->button1->TabIndex = 20;
this->button1->Text = L"Send";
this->button1->UseVisualStyleBackColor = true;
this->button1->Click += gcnew System::EventHandler(this, &ChildForm1::sendButton1);
//
// ChildForm1
//
this->AutoScaleDimensions = System::Drawing::SizeF(7, 17);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->BackColor = System::Drawing::Color::FromArgb
(static_cast<System::Int32>(static_cast<System::Byte>(182)),
static_cast<System::Int32>(static_cast<System::Byte>(200)),
static_cast<System::Int32>(static_cast<System::Byte>(200)));
this->ClientSize = System::Drawing::Size(331, 287);
this->Controls->Add(this->label3);
this->Controls->Add(this->label4);
this->Controls->Add(this->textBox4);
this->Controls->Add(this->textBox3);
this->Controls->Add(this->label2);
this->Controls->Add(this->label1);
this->Controls->Add(this->textBox2);
this->Controls->Add(this->textBox1);
this->Controls->Add(this->button2);
this->Controls->Add(this->button1);
this->Font = (gcnew System::Drawing::Font(L"Comic Sans MS", 9));
this->FormBorderStyle = System::Windows::Forms::FormBorderStyle::FixedSingle;
this->Margin = System::Windows::Forms::Padding(3, 4, 3, 4);
this->Name = L"ChildForm1";
this->Text = L"ChildForm1";
this->Load += gcnew System::EventHandler(this, &ChildForm1::load);
this->ResumeLayout(false);
this->PerformLayout();
}
#pragma endregion
// My problem is how a child form can subscribe to another sibling's event -
// you need to construct an instance of the sibling & I don't know how to do that
// So my current solution is to have the each child send a message to the parent,
// who in turn relays the message to its sibling.
private: System::Void load(System::Object^ sender, System::EventArgs^ e)
{
this->textBox3->Text = "hi parent from child1";
this->textBox4->Text = "hi child2 from child1";
}
public: void issueEvent1(System::Object^ sender, System::EventArgs^ e) //This is where
//we publish the event to all subscribers
{
this->myEvent1(this, e, this->textBox3->Text); // Raise the event using the EventDelegate
// signature
}
public: void issueEvent2(System::Object^ sender, System::EventArgs^ e) //This is where we
//publish the event to all subscribers
{
this->myEvent2(this, e, this->textBox4->Text); // Raise the event using the
// EventDelegate signature
}
public: void SetTextBox1(String^ string)
{
this->textBox1->Text = string;
}
public: void SetTextBox2(String^ string)
{
this->textBox2->Text = string;
}
private: System::Void sendButton1(System::Object^ sender, System::EventArgs^ e) {
this->issueEvent1(sender, e);
}
private: System::Void sendButton2(System::Object^ sender, System::EventArgs^ e) {
this->issueEvent2(sender, e);
}
};
}
子窗体 2
#pragma once
namespace PassingDataBetweenForms {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Collections::Generic;
using namespace System::Windows::Forms;
using namespace System::Drawing;
using namespace System::Text;
using namespace System::Diagnostics;
public ref class ChildForm2 : public System::Windows::Forms::Form
{
// Public events (using delegates) are declared here in order to publish strings
// for the subscriber (main form) who listens to these events
public: delegate void EventDelegate1(System::Object^ sender, System::EventArgs^ e,
String^ message); // Publish an event (with a text message) that others can subscribe to
public: event EventDelegate1^ myEvent1;
public: delegate void EventDelegate2(System::Object^ sender, System::EventArgs^ e,
String^ message); // Publish an event (with a text message) that others can subscribe to
public: event EventDelegate2^ myEvent2;
public:
ChildForm2(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
protected:
~ChildForm2()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::Label^ label3;
private: System::Windows::Forms::Label^ label4;
private: System::Windows::Forms::TextBox^ textBox4;
private: System::Windows::Forms::TextBox^ textBox3;
private: System::Windows::Forms::Label^ label2;
private: System::Windows::Forms::Label^ label1;
private: System::Windows::Forms::TextBox^ textBox2;
private: System::Windows::Forms::TextBox^ textBox1;
private: System::Windows::Forms::Button^ button2;
private: System::Windows::Forms::Button^ button1;
private:
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
this->label3 = (gcnew System::Windows::Forms::Label());
this->label4 = (gcnew System::Windows::Forms::Label());
this->textBox4 = (gcnew System::Windows::Forms::TextBox());
this->textBox3 = (gcnew System::Windows::Forms::TextBox());
this->label2 = (gcnew System::Windows::Forms::Label());
this->label1 = (gcnew System::Windows::Forms::Label());
this->textBox2 = (gcnew System::Windows::Forms::TextBox());
this->textBox1 = (gcnew System::Windows::Forms::TextBox());
this->button2 = (gcnew System::Windows::Forms::Button());
this->button1 = (gcnew System::Windows::Forms::Button());
this->SuspendLayout();
//
// label3
//
this->label3->AutoSize = true;
this->label3->Location = System::Drawing::Point(189, 121);
this->label3->Name = L"label3";
this->label3->Size = System::Drawing::Size(95, 17);
this->label3->TabIndex = 29;
this->label3->Text = L"Data To Sibling";
//
// label4
//
this->label4->AutoSize = true;
this->label4->Location = System::Drawing::Point(47, 121);
this->label4->Name = L"label4";
this->label4->Size = System::Drawing::Size(93, 17);
this->label4->TabIndex = 28;
this->label4->Text = L"Data To Parent";
//
// textBox4
//
this->textBox4->Location = System::Drawing::Point(173, 145);
this->textBox4->Multiline = true;
this->textBox4->Name = L"textBox4";
this->textBox4->Size = System::Drawing::Size(127, 79);
this->textBox4->TabIndex = 27;
//
// textBox3
//
this->textBox3->Location = System::Drawing::Point(30, 145);
this->textBox3->Multiline = true;
this->textBox3->Name = L"textBox3";
this->textBox3->Size = System::Drawing::Size(127, 79);
this->textBox3->TabIndex = 26;
//
// label2
//
this->label2->AutoSize = true;
this->label2->Location = System::Drawing::Point(182, 13);
this->label2->Name = L"label2";
this->label2->Size = System::Drawing::Size(108, 17);
this->label2->TabIndex = 25;
this->label2->Text = L"Data From Sibling";
//
// label1
//
this->label1->AutoSize = true;
this->label1->Location = System::Drawing::Point(40, 13);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(106, 17);
this->label1->TabIndex = 24;
this->label1->Text = L"Data From Parent";
//
// textBox2
//
this->textBox2->Location = System::Drawing::Point(173, 37);
this->textBox2->Multiline = true;
this->textBox2->Name = L"textBox2";
this->textBox2->Size = System::Drawing::Size(127, 79);
this->textBox2->TabIndex = 23;
//
// textBox1
//
this->textBox1->Location = System::Drawing::Point(30, 37);
this->textBox1->Multiline = true;
this->textBox1->Name = L"textBox1";
this->textBox1->Size = System::Drawing::Size(127, 79);
this->textBox1->TabIndex = 22;
//
// button2
//
this->button2->Location = System::Drawing::Point(173, 238);
this->button2->Name = L"button2";
this->button2->Size = System::Drawing::Size(127, 27);
this->button2->TabIndex = 21;
this->button2->Text = L"Send";
this->button2->UseVisualStyleBackColor = true;
this->button2->Click += gcnew System::EventHandler(this, &ChildForm2::sendButton2);
//
// button1
//
this->button1->Location = System::Drawing::Point(30, 238);
this->button1->Name = L"button1";
this->button1->Size = System::Drawing::Size(127, 27);
this->button1->TabIndex = 20;
this->button1->Text = L"Send";
this->button1->UseVisualStyleBackColor = true;
this->button1->Click += gcnew System::EventHandler(this, &ChildForm2::sendButton1);
//
// ChildForm2
//
this->AutoScaleDimensions = System::Drawing::SizeF(7, 17);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->BackColor = System::Drawing::Color::FromArgb
(static_cast<System::Int32>(static_cast<System::Byte>(182)),
static_cast<System::Int32>(static_cast<System::Byte>(200)),
static_cast<System::Int32>(static_cast<System::Byte>(200)));
this->ClientSize = System::Drawing::Size(331, 287);
this->Controls->Add(this->label3);
this->Controls->Add(this->label4);
this->Controls->Add(this->textBox4);
this->Controls->Add(this->textBox3);
this->Controls->Add(this->label2);
this->Controls->Add(this->label1);
this->Controls->Add(this->textBox2);
this->Controls->Add(this->textBox1);
this->Controls->Add(this->button2);
this->Controls->Add(this->button1);
this->Font = (gcnew System::Drawing::Font(L"Comic Sans MS", 9));
this->FormBorderStyle = System::Windows::Forms::FormBorderStyle::FixedSingle;
this->Margin = System::Windows::Forms::Padding(3, 4, 3, 4);
this->Name = L"ChildForm2";
this->Text = L"ChildForm2";
this->Load += gcnew System::EventHandler(this, &ChildForm2::load);
this->ResumeLayout(false);
this->PerformLayout();
}
#pragma endregion
// My problem is how a child form can subscribe to another sibling's event - you need to
// construct an instance of the sibling & I don't know how to do that
// So my current solution is to have the each child send a message to the parent,
// who in turn relays the message to its sibling.
private: System::Void load(System::Object^ sender, System::EventArgs^ e)
{
this->textBox3->Text = "hi parent from child2";
this->textBox4->Text = "hi child1 from child2";
}
public: void issueEvent1(System::Object^ sender, System::EventArgs^ e) //This is where we
//publish the event to all subscribers
{
this->myEvent1(this, e, this->textBox3->Text); // Raise the event using the EventDelegate
// signature
}
public: void issueEvent2(System::Object^ sender, System::EventArgs^ e) //This is where we
//publish the event to all subscribers
{
this->myEvent2(this, e, this->textBox4->Text); // Raise the event using the EventDelegate
// signature
}
public: void SetTextBox1(String^ string)
{
this->textBox1->Text = string;
}
public: void SetTextBox2(String^ string)
{
this->textBox2->Text = string;
}
private: System::Void sendButton1(System::Object^ sender, System::EventArgs^ e) {
this->issueEvent1(sender, e);
}
private: System::Void sendButton2(System::Object^ sender, System::EventArgs^ e) {
this->issueEvent2(sender, e);
}
};
}