BOOL
Cancel_Focus( LCUI_Widget *widget )
/*
* 功能：取消指定部件的焦点
* 说明：该部件会得到EVENT_FOCUS_OUT事件，并且，会将焦点转移至其它部件
* */
{
if( !widget || !widget->focus ) {
return FALSE;
}
int i, total, focus_pos;
LCUI_Widget *other_widget, **focus_widget;
LCUI_Queue *queue_ptr;
if( widget->parent ) {
focus_widget = &widget->parent->focus_widget;
queue_ptr = &widget->parent->child;
} else {
focus_widget = &LCUI_Sys.focus_widget;
queue_ptr = &LCUI_Sys.widget_list;
}
/* 寻找可获得焦点的其它部件 */
total = Queue_Get_Total( queue_ptr );
focus_pos = WidgetQueue_Get_Pos( queue_ptr, *focus_widget );
for( i=0; i<focus_pos; ++i ) {
other_widget = Queue_Get( queue_ptr, i);
if( other_widget && other_widget->visible
&& other_widget->focus ) {
Handle_Event( &widget->event, EVENT_FOCUS_IN );
*focus_widget = other_widget;
break;
}
}
if( i < focus_pos ) {
return TRUE;
}
/* 排在该部件前面的符合条件的部件没找到，就找排在该部件后面的 */
for( i=focus_pos+1; i<total; ++i ) {
other_widget = Queue_Get( queue_ptr, i);
if( other_widget && other_widget->visible
&& other_widget->focus ) {
Handle_Event( &widget->event, EVENT_FOCUS_IN );
*focus_widget = other_widget;
break;
}
}
/* 没找到就复位焦点 */
if( i >= total ) {
*focus_widget = NULL;
}
return TRUE;
}
static void
_End_DragEvent( LCUI_Widget *widget, LCUI_MouseEvent *event )
{
drag_event.cursor_pos = event->global_pos;
drag_event.new_pos = Pos_Sub( event->global_pos, __offset_pos );
drag_event.first_click = 0;
drag_event.end_click = 1;
Handle_Event( &widget->event, EVENT_DRAG );
}
static void
_Start_DragEvent( LCUI_Widget *widget, LCUI_MouseEvent *event )
{
drag_event.cursor_pos = event->global_pos;
/* 用全局坐标减去部件的全局坐标，得到偏移坐标 */
__offset_pos = Pos_Sub( event->global_pos, Get_Widget_Global_Pos( widget ) );
/* 得出部件的新全局坐标 */
drag_event.new_pos = Pos_Sub( event->global_pos, __offset_pos );
drag_event.first_click = 1;
drag_event.end_click = 0;
/* 处理部件的拖动事件 */
Handle_Event( &widget->event, EVENT_DRAG );
}
BOOL
Set_Focus( LCUI_Widget *widget )
/*
* 功能：为部件设置焦点
* 说明：上个获得焦点的部件会得到EVENT_FOCUS_OUT事件，而当前获得焦点的部件会得到
* EVENT_FOCUS_IN事件。
* */
{
if( widget ) {
/* 先处理上级部件的焦点 */
if( widget->parent ) {
Set_Focus( widget->parent );
}
if( !widget->focus ) {
return FALSE;
}
} else {
return FALSE;
}
LCUI_Widget **focus_widget;
if( widget->parent ) {
focus_widget = &widget->parent->focus_widget;
} else {
focus_widget = &LCUI_Sys.focus_widget;
}
if( *focus_widget ) {
/* 如果上次和这次的部件不一样 */
if( *focus_widget != widget ) {
Handle_Event( &(*focus_widget)->event, EVENT_FOCUS_OUT );
}
}
Handle_Event( &widget->event, EVENT_FOCUS_IN );
/* 保存新焦点位置 */
*focus_widget = widget;
return TRUE;
}
BOOL
Reset_Focus( LCUI_Widget* widget )
/* 复位指定部件内的子部件的焦点 */
{
LCUI_Widget** focus_widget;
if( widget ) {
focus_widget = &widget->focus_widget;
} else {
focus_widget = &LCUI_Sys.focus_widget;
}
if( *focus_widget ) {
Handle_Event( &(*focus_widget)->event, EVENT_FOCUS_OUT );
}
*focus_widget = NULL;
return TRUE;
}
static void
Widget_Clicked(LCUI_MouseEvent *event)
/*
* 功能：用于处理click事件，并保存被点击后的部件的指针
* 说明：在鼠标左键被按下/释放时，都会调用这个函数
**/
{
LCUI_Widget *widget;
if( !event ) {
return;
}
widget = event->widget;
switch( Mouse_LeftButton(event) ) {
case PRESSED:
DEBUG_MSG("mouse left button pressed\n");
click_widget = widget;
/* 焦点转移给该部件 */
Set_Focus( widget );
if( Widget_Have_Event( widget, EVENT_DRAG ) ) {
/* 开始处理部件的拖动 */
DEBUG_MSG("widget have EVENT_DRAG\n");
_Start_DragEvent( widget, event );
}
widget = Get_ResponseStatusChange_Widget( widget );
if( !widget ) {
DEBUG_MSG("widget not response status change\n");
break;
}
/* 如果当前鼠标指针覆盖到的部件已被启用 */
if( event->widget->enabled && widget->enabled ) {
Set_Widget_Status (widget, WIDGET_STATUS_CLICKING);
} else {
Set_Widget_Status (widget, WIDGET_STATUS_DISABLE);
}
break;
case FREE:
DEBUG_MSG("mouse left button free\n");
if( !click_widget ) {
/* 如果是点击屏幕空白处，则复位焦点 */
Reset_Focus( NULL );
break;
}
if( Widget_Have_Event( click_widget, EVENT_DRAG ) ) {
DEBUG_MSG("end drag\n");
_End_DragEvent( click_widget, event );
}
if(click_widget == widget) {
click_widget = NULL;
/* 如果点击时和点击后都在同一个按钮部件内进行的,
* 触发CLICKED事件，将部件中关联该事件的回调函数发送至
* 任务队列，使之在主循环中执行
* */
widget = Get_ResponseEvent_Widget( event->widget, EVENT_CLICKED );
if( widget && widget->enabled ) {
Handle_Event(&widget->event, EVENT_CLICKED);
}
widget = Get_ResponseStatusChange_Widget(event->widget);
if( !widget ) {
break;
}
if(widget->enabled) {
Set_Widget_Status (widget, WIDGET_STATUS_CLICKED);
Set_Widget_Status (widget, WIDGET_STATUS_OVERLAY);
break;
}
Set_Widget_Status (widget, WIDGET_STATUS_DISABLE);
break;
}
/* 否则，将恢复之前点击的鼠标的状态 */
widget = Get_ResponseStatusChange_Widget(click_widget);
click_widget = NULL;
if( !widget ) {
break;
}
if(widget->enabled) {
Set_Widget_Status (widget, WIDGET_STATUS_NORMAL);
} else {
Set_Widget_Status (widget, WIDGET_STATUS_DISABLE);
}
}
}
void main(void)
{
student_struct student_list[MAX_STUDENTS]; // Array of students
int user_choice=0; // User choice
FILE *grades=NULL, *students=NULL; // Files for student/grade info
//
// Open and check for errors in grades file
//
if ((grades = fopen("grades.dat", "r")) == NULL)
{
cerr << "Error opening grades.dat!\n";
exit(1);
}
//
// Open and check for error in student file
//
if ((students = fopen("Students.dat", "r")) == NULL)
{
cerr << "Error opening students.dat!\n";
exit(1);
}
//
// Reset all student structures
//
ResetStudents(student_list);
//
// Read the grades in from the grades file
//
ReadGrades(grades, student_list);
//
// Read the students in from the students file
//
ReadStudents(students, student_list);
cout << "Student file read.\n";
//
// Calculate needed student information
//
CalculateInfo(student_list);
cout << "Grades updated.\n\n\n";
//
// Loop to run functions chosen by user
//
do
{
user_choice = Main_Menu(); // Get user choice from menu screen
Handle_Event(user_choice, student_list); // Handle user choices
}while(user_choice != EXIT_NUMBER); // End loop when user enters exit
// condition
//
// Close both files
//
fclose(grades);
fclose(students);
}
