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Fixed screen implementation.

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This commit is contained in:
t-moe
2015-04-27 23:59:00 +02:00
parent cf72baaa3a
commit 77e6d0e061
2 changed files with 36 additions and 18 deletions
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46
common/gui/screen.c
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@@ -1,17 +1,36 @@
#include "screen.h"
static SCREEN_STRUCT* screen_list = NULL;
static SCREEN_STRUCT* screen_current = NULL;
static volatile SCREEN_STRUCT* screen_list = NULL;
static volatile SCREEN_STRUCT* screen_current = NULL;
static volatile SCREEN_STRUCT* screen_goto = NULL;
SCREEN_STRUCT* gui_screen_get_current() {
return screen_current;
}
void gui_screen_update() {
if(screen_current!=NULL) {
screen_current->on_update(screen_current);
if(screen_goto!=NULL) { //we received the task to switch the screen
SCREEN_STRUCT* go = screen_goto; //Backup volatile variable
screen_goto=NULL;
if(go->next!=NULL) { //we're going back
if(go->next!=screen_current) return; //list corrupted?
screen_current->on_leave(screen_current);
go->next=NULL;
} else { //we're going forward
if(screen_current!=NULL) { //this is not the first screen
screen_current->on_leave(screen_current);
screen_current->next = go;
} else { //first screen ever seen
screen_list=go;
}
}
go->on_enter(go);
screen_current = go;
}
if(screen_current!=NULL) { //A screen has been set
screen_current->on_update(screen_current); //Update current screen
}
}
@@ -20,14 +39,7 @@ void gui_screen_update() {
bool gui_screen_navigate(SCREEN_STRUCT* screen) {
if(screen==NULL) return false;
screen->next = NULL;
if(screen_current!=NULL) {
screen_current->on_leave(screen_current);
screen_current->next = screen;
} else {
screen_list=screen;
}
screen->on_enter(screen);
screen_current = screen;
screen_goto=screen; //send message to main loop, to switch the screen
return true;
}
@@ -37,17 +49,15 @@ bool gui_screen_back() {
if(screen_list==NULL) return false;
SCREEN_STRUCT* current = screen_list;
SCREEN_STRUCT* last = NULL;
//Find second last element in list
while(current->next != NULL) {
last = current;
current = current->next;
}
if(last==NULL) return false; //There's only a single screen.
if(current!=screen_current) return false; //List corrupted?
current->on_leave(current);
last->next=NULL;
last->on_enter(last);
screen_current=last;
return true;
screen_goto=last; //send message to main loop, to switch the screen
return true;
}