recovery: Implement sysbar

Add a system bar (navigation bar) similar to the main Android system
with back and home buttons.  This makes it easier for users to figure
out how to go back on devices that lack hardware buttons, and also
provides a quick way to get back to the main menu.

Note only buttons that do not have a hardware equivalent are shown, in
order to prevent redundancy and confusion.

Change-Id: I7538749978837571a8c250c3c8e54ac127b39d84

1 files changed, 16 insertions, 0 deletions

diff --git a/screen_ui.h b/screen_ui.h
index 93d06bc..9d7b263 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -23,6 +23,9 @@
 #include "ui.h"
 #include "minui/minui.h"
 
+#define SYSBAR_BACK     0x01
+#define SYSBAR_HOME     0x02
+
 // Implementation of RecoveryUI appropriate for devices with a screen
 // (shows an icon + a progress bar, text logging, menu, etc.)
 class ScreenRecoveryUI : public RecoveryUI {
@@ -60,6 +63,11 @@ class ScreenRecoveryUI : public RecoveryUI {
     void DialogDismiss();
     void SetHeadlessMode();
 
+    // sysbar
+    int  GetSysbarHeight() { return gr_get_height(sysbarBackHighlightIcon); }
+    int  GetSysbarState() { return sysbar_state; }
+    void SetSysbarState(int state) { sysbar_state = state; Redraw(); }
+
     // menu display
     virtual int MenuItemStart() const { return menu_item_start_; }
     virtual int MenuItemHeight() const { return 3 * char_height_; }
@@ -87,6 +95,10 @@ class ScreenRecoveryUI : public RecoveryUI {
     pthread_cond_t  progressCondition;
 
     GRSurface* headerIcon;
+    GRSurface* sysbarBackIcon;
+    GRSurface* sysbarBackHighlightIcon;
+    GRSurface* sysbarHomeIcon;
+    GRSurface* sysbarHomeHighlightIcon;
     GRSurface* backgroundIcon[NR_ICONS];
     GRSurface* backgroundText[NR_ICONS];
     GRSurface** installation;
@@ -126,6 +138,8 @@ class ScreenRecoveryUI : public RecoveryUI {
     int menu_show_start_;
     int max_menu_rows_;
 
+    int sysbar_state;
+
     // An alternate text screen, swapped with 'text_' when we're viewing a log file.
     char** file_viewer_text_;
 
@@ -147,6 +161,7 @@ class ScreenRecoveryUI : public RecoveryUI {
     int char_height_, char_width_;
 
     int header_height_, header_width_;
+    int sysbar_height_;
     int text_first_row_;
 
     bool update_waiting;
@@ -155,6 +170,7 @@ class ScreenRecoveryUI : public RecoveryUI {
     void draw_progress_locked();
     int  draw_header_icon();
     void draw_menu_item(int textrow, const char *text, int selected);
+    void draw_sysbar();
     void draw_dialog();
     void draw_screen_locked();
     void update_screen_locked();