HandlerChain_Exercise.c

Go to the documentation of this file.

 
 
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "HandlerChain_MessageWindow.h"
#include "HandlerChain_HandlerFunctions.h"
#include "HandlerChain_Exercise.h"
 
//=============================================================================
//=============================================================================
 
static void _HandlerChain_ConstructWindowChain(int windowIds[3])
{
    windowIds[0] = MessageWindow_Create("Window 1", 0, 0, 10, 10);
    windowIds[1] = MessageWindow_Create("Window 2", 20, 0, 5, 5);
    windowIds[2] = MessageWindow_Create("Window 3", 30, 10, 15, 15);
}
 
 
static void _HandleChain_DestroyWindows(int windowIds[3])
{
    size_t numIds = 3;
    Message destroyMessage;
    Message_Initialize(&destroyMessage, Destroy, 0, 0);
    for (size_t index = 0; index < numIds; index++)
    {
        HandlerChain_SendMessage(windowIds[index], &destroyMessage);
    }
}
 
static void _ShowHandlerChain(const char* prompt)
{
    if (prompt == NULL)
    {
        prompt = "<NO PROMPT>";
    }
    printf("  %s\n", prompt);
    DynamicString output = { 0 };
    HandlerChain_ToString(&output);
    printf("%s\n", output.string);
    DynamicString_Clear(&output);
}
 
//=============================================================================
//=============================================================================
 
// ! [Using HandlerChain in C]
void HandlerChain_Exercise(void)
{
    printf("\nHandlerChain Exercise\n");
 
    // Construct several windows that can handle messages.  These are
    // automatically handled to the handler chain list during construction.
    int windowIds[3] = { 0 };
    _HandlerChain_ConstructWindowChain(windowIds);
 
    _ShowHandlerChain("Handler Chain at start:");
 
    // Now pass messages to the windows.
 
    printf("  Select Window 2\n");
    Message buttonDownMessage;
    Message_Initialize(&buttonDownMessage, ButtonDown, 22, 1);
    HandlerChain_SendMessage(-1, &buttonDownMessage);
 
    Message buttonUpMessage;
    Message_Initialize(&buttonUpMessage, ButtonUp, 22, 1);
    HandlerChain_SendMessage(-1, &buttonUpMessage);
    _ShowHandlerChain("Current handler chain:");
 
    printf("  Select Window 3\n");
    Message_Initialize(&buttonDownMessage, ButtonDown, 35, 11);
    HandlerChain_SendMessage(-1, &buttonDownMessage);
 
    Message_Initialize(&buttonUpMessage, ButtonUp, 35, 11);
    HandlerChain_SendMessage(-1, &buttonUpMessage);
    _ShowHandlerChain("Current handler chain:");
 
    printf("  Select Window 1\n");
    Message_Initialize(&buttonDownMessage, ButtonDown, 4, 4);
    HandlerChain_SendMessage(-1, &buttonDownMessage);
 
    Message_Initialize(&buttonUpMessage, ButtonUp, 4, 4);
    HandlerChain_SendMessage(-1, &buttonUpMessage);
    _ShowHandlerChain("Current handler chain:");
 
    printf("  Close Window 2\n");
    Message_Initialize(&buttonDownMessage, ButtonDown, 24, 0);
    HandlerChain_SendMessage(-1, &buttonDownMessage);
 
    Message_Initialize(&buttonUpMessage, ButtonUp, 24, 0);
    HandlerChain_SendMessage(-1, &buttonUpMessage);
    _ShowHandlerChain("Current handler chain:");
 
    printf("  Removing all windows as part of clean-up.\n");
    _HandleChain_DestroyWindows(windowIds);
 
    printf("  Done.\n");
}
// ! [Using HandlerChain in C]