Add small calculator GUI demo.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 523

2 files changed, 164 insertions, 1 deletions

diff --git a/textscreen/Makefile.am b/textscreen/Makefile.am
index 49a0374d..442839fc 100644
--- a/textscreen/Makefile.am
+++ b/textscreen/Makefile.am
@@ -2,7 +2,7 @@
 AM_CFLAGS = @SDL_CFLAGS@ -I../src
 
 noinst_LIBRARIES=libtextscreen.a
-bin_PROGRAMS=guitest
+bin_PROGRAMS=guitest calculator
 
 libtextscreen_a_SOURCES =                                 \
 	txt_checkbox.c           txt_checkbox.h           \
@@ -24,3 +24,6 @@ libtextscreen_a_SOURCES =                                 \
 guitest_LDADD = @SDL_LIBS@ libtextscreen.a
 guitest_SOURCES = guitest.c
 
+calculator_LDADD = @SDL_LIBS@ libtextscreen.a
+calculator_SOURCES = calculator.c
+
diff --git a/textscreen/calculator.c b/textscreen/calculator.c
new file mode 100644
index 00000000..d51d4f9c
--- /dev/null
+++ b/textscreen/calculator.c
@@ -0,0 +1,160 @@
+
+#include <stdio.h>
+#include <string.h>
+#include "txt_button.h"
+#include "txt_desktop.h"
+#include "txt_label.h"
+
+typedef enum
+{
+    OP_NONE,
+    OP_PLUS,
+    OP_MINUS,
+    OP_MULT,
+    OP_DIV,
+} operator_t;
+
+int starting_input = 0;
+int input_value = 0;
+txt_label_t *input_box;
+int first_operand;
+operator_t operator = OP_NONE;
+
+void UpdateInputBox(void)
+{
+    char buf[20];
+
+    sprintf(buf, " %i", input_value);
+    TXT_SetLabel(input_box, buf);
+}
+
+void InsertNumber(TXT_UNCAST_ARG(button), TXT_UNCAST_ARG(value))
+{
+    TXT_CAST_ARG(int, value);
+
+    if (starting_input)
+    {
+        input_value = 0;
+        starting_input = 0;
+    }
+    
+    input_value *= 10;
+    input_value += *value;
+    UpdateInputBox();
+}
+
+void AddNumberButton(txt_table_t *table, int value)
+{
+    txt_button_t *button;
+    char buf[10];
+    int *val_copy;
+
+    val_copy = malloc(sizeof(int));
+    *val_copy = value;
+
+    sprintf(buf, "  %i  ", value);
+
+    button = TXT_NewButton(buf);
+    TXT_AddWidget(table, button);
+    TXT_SignalConnect(button, "pressed", InsertNumber, val_copy);
+}
+
+void Operator(TXT_UNCAST_ARG(button), TXT_UNCAST_ARG(op))
+{
+    TXT_CAST_ARG(operator_t, op);
+
+    first_operand = input_value;
+    operator = *op;
+    starting_input = 1;
+}
+
+void AddOperatorButton(txt_table_t *table, char *label, operator_t op)
+{
+    txt_button_t *button;
+    char buf[10];
+    operator_t *op_copy;
+
+    op_copy = malloc(sizeof(operator_t));
+    *op_copy = op;
+
+    sprintf(buf, "  %s  ", label);
+    button = TXT_NewButton(buf);
+
+    TXT_AddWidget(table, button);
+    TXT_SignalConnect(button, "pressed", Operator, op_copy);
+}
+
+void Calculate(TXT_UNCAST_ARG(button), void *unused)
+{
+    switch (operator)
+    {
+        case OP_PLUS:
+            input_value = first_operand + input_value;
+            break;
+        case OP_MINUS:
+            input_value = first_operand - input_value;
+            break;
+        case OP_MULT:
+            input_value = first_operand * input_value;
+            break;
+        case OP_DIV:
+            input_value = first_operand / input_value;
+            break;
+    }
+
+    UpdateInputBox();
+
+    operator = OP_NONE;
+    starting_input = 1;
+}
+
+void BuildGUI()
+{
+    txt_window_t *window;
+    txt_table_t *table;
+    txt_button_t *equals_button;
+    
+    window = TXT_NewWindow("Calculator");
+
+    TXT_AddWidget(window, TXT_NewSeparator(NULL));
+    input_box = TXT_NewLabel("asdf");
+    TXT_AddWidget(window, input_box);
+    TXT_AddWidget(window, TXT_NewSeparator(NULL));
+    TXT_AddWidget(window, TXT_NewLabel(""));
+
+    table = TXT_NewTable(4);
+    TXT_AddWidget(window, table);
+
+    AddNumberButton(table, 7);
+    AddNumberButton(table, 8);
+    AddNumberButton(table, 9);
+    AddOperatorButton(table, "*", OP_MULT);
+    AddNumberButton(table, 4);
+    AddNumberButton(table, 5);
+    AddNumberButton(table, 6);
+    AddOperatorButton(table, "-", OP_MINUS);
+    AddNumberButton(table, 1);
+    AddNumberButton(table, 2);
+    AddNumberButton(table, 3);
+    AddOperatorButton(table, "+", OP_PLUS);
+    AddNumberButton(table, 0);
+    TXT_AddWidget(table, TXT_NewLabel(""));
+    equals_button = TXT_NewButton("  =  ");
+    TXT_SignalConnect(equals_button, "pressed", Calculate, NULL);
+    TXT_AddWidget(table, equals_button);
+    AddOperatorButton(table, "/", OP_DIV);
+    
+    TXT_AddWidget(window, TXT_NewLabel(""));
+    UpdateInputBox();
+}
+
+int main()
+{
+    TXT_Init();
+    TXT_SetDesktopTitle("Calculator demo");
+
+    BuildGUI();
+
+    TXT_GUIMainLoop();
+}
+