From 89f2e15d0bb05121da3b7583cd672cccc4a09104 Mon Sep 17 00:00:00 2001
From: shikhin <draumr.shikhin@gmail.com>
Date: Thu, 23 Mar 2023 07:20:41 +0530
Subject: [PATCH] Add window resizing

---
 shell.asm | 107 +++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 90 insertions(+), 17 deletions(-)

diff --git a/shell.asm b/shell.asm
index 62219a5..3339794 100644
--- a/shell.asm
+++ b/shell.asm
@@ -18,6 +18,9 @@ endstruc
 WINDOW_MOVE equ 1
 WINDOW_RESIZE equ 2
 
+WINDOW_MIN_WIDTH equ 4
+WINDOW_MIN_HEIGHT equ 2
+
 cpu 8086
 bits 16
 
@@ -188,7 +191,7 @@ mouse:
 	.not_move:
 	cmp byte [si + window.status], WINDOW_RESIZE
 	jne .not_resize
-	;call window_resize
+	call resize
 	.not_resize:
 
 	sub cx, [si + window.x]
@@ -237,6 +240,40 @@ mouse:
 		call forward_event
 		ret
 
+; in:
+;  ax = window ID
+;  bx = Y coördinate
+;  cx = X coördinate
+;  si = pointer to window structure
+resize:
+	push dx
+
+	mov dx, [si + window.res_y]
+	sub dx, bx
+	jc .x
+	cmp dx, WINDOW_MIN_HEIGHT
+	jl .x
+
+	mov [si + window.y], bx
+	mov [si + window.height], dx
+
+	.x:
+	mov dx, [si + window.res_x]
+	sub dx, cx
+	jc .done
+	cmp dx, WINDOW_MIN_WIDTH
+	jl .done
+
+	mov [si + window.x], cx
+	mov [si + window.width], dx
+
+	.done:
+	pop dx
+
+	call render_file_window
+	call request_redraw
+	ret
+
 ; in:
 ;  ax = window ID
 ;  bx = Y coördinate
@@ -287,8 +324,8 @@ click:
 
 		; If clicked the window close button
 		mov ax, [si + window.x]
-		;cmp ax, cx
-		;je .resize
+		cmp ax, cx
+		je .resize
 		add ax, [si + window.width]
 		dec ax
 		cmp ax, cx
@@ -296,8 +333,17 @@ click:
 		.move:
 			mov byte [si + window.status], WINDOW_MOVE
 			sub cx, [si + window.x]
-			mov [si + window.res_x], cx
+			mov [si + window.res_x], cx ; In-window x-coordinate of press
 			jmp .end
+
+		.resize:
+			mov byte [si + window.status], WINDOW_RESIZE
+			add cx, [si + window.width]
+			mov [si + window.res_x], cx ; Lower right corner + 1
+			add bx, [si + window.height]
+			mov [si + window.res_y], bx ; Lower right corner + 1
+			jmp .end
+
 		.close:
 			call hide_file_window
 			jmp .end
@@ -341,6 +387,43 @@ click:
 	pop dx
 	ret
 
+; in
+;  si = pointer to window structure
+render_file_window:
+	push ax
+	push cx
+	push dx
+	push es
+
+	mov ax, cs
+	mov es, ax
+	mov di, [si + window.data]
+	mov cx, [si + window.width]
+	mov ax, 0x0f00
+	rep stosw
+
+	mov cx, (ROWS-1)*COLUMNS
+	mov ax, 0xf000
+	rep stosw
+
+	mov di, [si + window.data]
+	mov byte [di], 'A'
+	mov byte [di + 2], ':'
+	add di, [si + window.width]
+	add di, [si + window.width]
+	mov byte [di - 2], 'x'
+
+	mov cx, [si + window.height]
+	dec cx
+	mov dx, [si + window.width]
+	call print_ls
+
+	pop es
+	pop dx
+	pop cx
+	pop ax
+	ret
+
 show_file_window:
 	cmp byte [file_window_visible], 0
 	jne .already_visible
@@ -356,15 +439,8 @@ show_file_window:
 	mov [windows + 1*window.size + window.next], ax
 
 	; Populate file window contents
-	mov ax, cs
-	mov es, ax
-	mov di, file_window
-	add di, [windows + 1*window.size + window.width]
-	add di, [windows + 1*window.size + window.width]
-	mov cx, [windows + 1*window.size + window.height]
-	dec cx
-	mov dx, [windows + 1*window.size + window.width]
-	call print_ls
+	mov si, windows + 1*window.size
+	call render_file_window
 
 	pop ax
 
@@ -851,10 +927,7 @@ disk_icon:
 	db 0x00, 0x0f, 0x00, 0x0f, '|', 0x0f, 0x00, 0x0f, 0x00, 0x0f
 
 file_window:
-	db 'A', 0x0f, ':', 0x0f
-	times 37 db ' ', 0x0f
-	db 'x', 0x0f
-	times 15*40 db 0, 0xf0
+	times ROWS*COLUMNS db 0, 0xf0
 
 windows:
 	times window.size db 0