htop/MetersPanel.c

/*
htop - MetersPanel.c
(C) 2004-2011 Hisham H. Muhammad
Released under the GNU GPL, see the COPYING file
in the source distribution for its full text.
*/

#include "MetersPanel.h"

#include <stdlib.h>
#include <assert.h>

/*{
#include "Panel.h"
#include "Settings.h"
#include "ScreenManager.h"

typedef struct MetersPanel_ MetersPanel;

struct MetersPanel_ {
   Panel super;

   Settings* settings;
   Vector* meters;
   ScreenManager* scr;
   MetersPanel* leftNeighbor;
   MetersPanel* rightNeighbor;
   bool moving;
};

}*/

static void MetersPanel_delete(Object* object) {
   Panel* super = (Panel*) object;
   MetersPanel* this = (MetersPanel*) object;
   Panel_done(super);
   free(this);
}

static inline bool moveToNeighbor(MetersPanel* this, MetersPanel* neighbor, int selected) {
   Panel* super = (Panel*) this;
   if (this->moving) {
      if (neighbor) {
         if (selected < Vector_size(this->meters)) {
            ((ListItem*)Panel_getSelected(super))->moving = false;

            Meter* meter = (Meter*) Vector_take(this->meters, selected);
            Panel_remove(super, selected);
            Vector_insert(neighbor->meters, selected, meter);
            Panel_insert(&(neighbor->super), selected, (Object*) Meter_toListItem(meter, false));
            Panel_setSelected(&(neighbor->super), selected);

            this->moving = false;
            neighbor->moving = true;
            ((ListItem*)Panel_getSelected((Panel*)neighbor))->moving = true;
            return true;
         }
      }
   }
   return false;
}

static HandlerResult MetersPanel_eventHandler(Panel* super, int ch) {
   MetersPanel* this = (MetersPanel*) super;
   
   int selected = Panel_getSelectedIndex(super);
   HandlerResult result = IGNORED;
   bool sideMove = false;

   switch(ch) {
      case 0x0a:
      case 0x0d:
      case KEY_ENTER:
      {
         this->moving = !(this->moving);
         ((ListItem*)Panel_getSelected(super))->moving = this->moving;
         result = HANDLED;
         break;
      }
      case ' ':
      case KEY_F(4):
      case 't':
      {
         Meter* meter = (Meter*) Vector_get(this->meters, selected);
         int mode = meter->mode + 1;
         if (mode == LAST_METERMODE) mode = 1;
         Meter_setMode(meter, mode);
         Panel_set(super, selected, (Object*) Meter_toListItem(meter, this->moving));
         result = HANDLED;
         break;
      }
      case KEY_UP:
      {
         if (!this->moving) {
            break;
         }
         /* else fallthrough */
      }
      case KEY_F(7):
      case '[':
      case '-':
      {
         Vector_moveUp(this->meters, selected);
         Panel_moveSelectedUp(super);
         result = HANDLED;
         break;
      }
      case KEY_DOWN:
      {
         if (!this->moving) {
            break;
         }
         /* else fallthrough */
      }
      case KEY_F(8):
      case ']':
      case '+':
      {
         Vector_moveDown(this->meters, selected);
         Panel_moveSelectedDown(super);
         result = HANDLED;
         break;
      }
      case KEY_RIGHT:
      {
         sideMove = moveToNeighbor(this, this->rightNeighbor, selected);
         if (this->moving && !sideMove) {
            // lock user here until it exits positioning-mode
            result = HANDLED;
         }
         // if user is free, don't set HANDLED;
         // let ScreenManager handle focus.
         break;
      }
      case KEY_LEFT:
      {
         sideMove = moveToNeighbor(this, this->leftNeighbor, selected);
         if (this->moving && !sideMove) {
            result = HANDLED;
         }
         break;
      }
      case KEY_F(9):
      case KEY_DC:
      {
         if (selected < Vector_size(this->meters)) {
            Vector_remove(this->meters, selected);
            Panel_remove(super, selected);
         }
         result = HANDLED;
         break;
      }
   }
   if (result == HANDLED || sideMove) {
      Header* header = (Header*) this->scr->header;
      this->settings->changed = true;
      Header_calculateHeight(header);
      Header_draw(header);
      ScreenManager_resize(this->scr, this->scr->x1, header->height, this->scr->x2, this->scr->y2);
   }
   return result;
}

PanelClass MetersPanel_class = {
   .super = {
      .extends = Class(Panel),
      .delete = MetersPanel_delete
   },
   .eventHandler = MetersPanel_eventHandler
};

MetersPanel* MetersPanel_new(Settings* settings, const char* header, Vector* meters, ScreenManager* scr) {
   MetersPanel* this = AllocThis(MetersPanel);
   Panel* super = (Panel*) this;
   Panel_init(super, 1, 1, 1, 1, Class(ListItem), true);

   this->settings = settings;
   this->meters = meters;
   this->scr = scr;
   this->moving = false;
   this->rightNeighbor = NULL;
   this->leftNeighbor = NULL;
   Panel_setHeader(super, header);
   for (int i = 0; i < Vector_size(meters); i++) {
      Meter* meter = (Meter*) Vector_get(meters, i);
      Panel_add(super, (Object*) Meter_toListItem(meter, false));
   }
   return this;
}