208 lines
3.9 KiB
NASM
208 lines
3.9 KiB
NASM
; widget management routines
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; widget types
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const WIDGET_TYPE_BUTTON: 0x00000000
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; widget struct:
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; data.32 next_ptr - pointer to next widget, or 0 for none
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; data.32 id - the ID number of this widget
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; data.32 type - the type of this widget
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; remaining entries vary depending on widget type
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; draw all of a window's widgets to a window
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; inputs:
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; r0: pointer to window struct
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; outputs:
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; none
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draw_widgets_to_window:
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push r10
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; get pointer to first widget
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mov r10, r0
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add r10, 32
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mov r10, [r10]
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draw_widgets_to_window_next:
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; check widget type
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add r10, 8
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cmp [r10], WIDGET_TYPE_BUTTON
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ifz call draw_widgets_to_window_button
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; point to the next widget, if any
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sub r10, 8
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mov r10, [r10]
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cmp r10, 0
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ifz jmp draw_widgets_to_window_done
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jmp draw_widgets_to_window_next
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draw_widgets_to_window_done:
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pop r10
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ret
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draw_widgets_to_window_button:
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push r1
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push r2
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push r3
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push r4
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push r5
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push r6
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push r7
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push r10
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; put button parameters in registers for the drawing routine
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add r10, 4
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mov r1, [r10] ; text_ptr
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add r10, 4
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mov r2, [r10] ; foreground_color
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add r10, 4
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mov r3, [r10] ; background_color
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add r10, 4
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movz.16 r4, [r10] ; width
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add r10, 2
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movz.16 r7, [r10] ; height
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add r10, 2
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movz.16 r5, [r10] ; x_pos
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add r10, 2
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movz.16 r6, [r10] ; y_pos
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call draw_button_widget
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pop r10
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pop r7
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pop r6
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pop r5
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pop r4
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pop r3
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pop r2
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pop r1
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ret
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; check if a widget was clicked and if so, add an event to the window's event queue
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; inputs:
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; r0: pointer to window struct
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; r1: X coordinate of click
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; r2: Y coordinate of click
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; outputs:
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; none
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handle_widget_click:
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push r0
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push r1
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push r2
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push r3
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push r4
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push r5
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push r6
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push r7
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push r8
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push r30
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mov r30, r0
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; get pointer to first widget
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add r0, 32
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mov r0, [r0]
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handle_widget_click_check_type:
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; check widget type
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add r0, 8
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cmp [r0], WIDGET_TYPE_BUTTON
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ifz jmp handle_widget_click_button
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handle_widget_click_done:
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pop r30
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pop r8
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pop r7
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pop r6
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pop r5
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pop r4
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pop r3
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pop r2
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pop r1
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pop r0
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ret
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handle_widget_click_button:
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push r0
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push r10
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push r11
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push r12
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push r13
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push r21
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push r22
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; get button width
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add r0, 16
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movz.16 r10, [r0]
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; get button height
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add r0, 2
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movz.16 r13, [r0]
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cmp r13, 16
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iflt mov r13, 16
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; get button X coordinate
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add r0, 2
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movz.16 r11, [r0]
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; get button Y coordinate
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add r0, 2
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movz.16 r12, [r0]
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; calculate button's right side coordinate
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mov r21, r11
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add r21, r10
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; calculate button's bottom right corner coordinate
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mov r22, r12
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add r22, r13
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; check if r1 is between r11 and r21
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; and if r2 is between r12 and r22
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cmp r1, r11
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iflt jmp handle_widget_click_button_no_click
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cmp r1, r21
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ifgt jmp handle_widget_click_button_no_click
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cmp r2, r12
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iflt jmp handle_widget_click_button_no_click
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cmp r2, r22
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ifgt jmp handle_widget_click_button_no_click
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; if we reach this point then the button was clicked!!
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pop r22
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pop r21
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pop r13
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pop r12
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pop r11
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pop r10
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pop r0
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; add a button click event to the window
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sub r0, 4
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mov r1, [r0] ; parameter 0: widget ID
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mov r2, 0
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mov r3, 0
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mov r4, 0
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mov r5, 0
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mov r6, 0
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mov r7, 0
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mov r8, r30
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mov r0, EVENT_TYPE_BUTTON_CLICK
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call new_window_event
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jmp handle_widget_click_done
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handle_widget_click_button_no_click:
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pop r22
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pop r21
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pop r13
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pop r12
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pop r11
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pop r10
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pop r0
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; get pointer to next widget
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sub r0, 8
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mov r0, [r0]
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; if this is the last widget, then exit
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cmp r0, 0
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ifz jmp handle_widget_click_done
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; retry
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jmp handle_widget_click_check_type
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; include widget types
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#include "widget/button.asm"
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