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Add documentation for C and C# calculator examples

This commit is contained in:
Xavi Artigas 2019-10-24 12:44:25 +02:00
parent f9486b6bfd
commit d57c8e2d28
2 changed files with 54 additions and 14 deletions
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32
apps/c/calculator/src/calculator.c
View File

@ -6,17 +6,21 @@
#include <efl_ui_text.eo.h>
#include <efl_text_interactive.eo.h>
static Efl_Ui_Text *_screen = NULL;
static int _prev_value = 0, _curr_value = 0;
static char _operation = '=';
static Eina_Bool _must_overwrite = EINA_FALSE;
static Efl_Ui_Text *_screen = NULL; // Text widget showing current value
static int _prev_value = 0; // Value introduced before an operation (first operand
static int _curr_value = 0; // Value currently being introduced (second operand)
static char _operation = '='; // Last operation button pressed
static Eina_Bool _must_overwrite = EINA_FALSE; // Whether next number must be appended to current input
// or overwrite it
// Quits the application
static void
_gui_quit_cb(void *data EINA_UNUSED, const Efl_Event *event EINA_UNUSED)
{
efl_exit(0);
}
// Performs "operation" on "currValue" and "prevValue" and leaves result in "currValue"
static void
_operate()
{
@ -39,10 +43,12 @@ _operate()
}
}
// Called every time a button is pressed
static void
_button_pressed_cb(void *data, const Efl_Event *event EINA_UNUSED)
{
char button = ((const char *)data)[0];
// If it is a number, append it to current input (or replace it)
if (button >= '0' && button <= '9')
{
char str[2] = { button, '\0' };
@ -60,6 +66,7 @@ _button_pressed_cb(void *data, const Efl_Event *event EINA_UNUSED)
switch (button)
{
case 'C':
// Clear current input
efl_text_set(_screen, "0");
break;
case '+':
@ -67,12 +74,14 @@ _button_pressed_cb(void *data, const Efl_Event *event EINA_UNUSED)
case '*':
case '/':
case '=':
// If there was a pending operation, perform it
if (_operation != '=')
{
_operate();
snprintf(str, sizeof(str), "%d", _curr_value);
efl_text_set(_screen, str);
}
// Store this operation
_operation = button;
_must_overwrite = EINA_TRUE;
_prev_value = _curr_value;
@ -83,6 +92,10 @@ _button_pressed_cb(void *data, const Efl_Event *event EINA_UNUSED)
}
}
// Called every time the content of the screen changes
// We use it to sanitize input (remove heading zeros, for example)
// This makes more sense when the Text widget is editable, since the user
// is free to type anything.
static void
_screen_changed_cb(void *data EINA_UNUSED, const Efl_Event *event EINA_UNUSED)
{
@ -104,8 +117,10 @@ _screen_changed_cb(void *data EINA_UNUSED, const Efl_Event *event EINA_UNUSED)
}
}
// text is what is drawn on the button, which might be a multi-byte unicode string.
// command is a single-char id for the button.
// Creates an Efl.Ui.Button and positions it in the given position inside the table
// The button text is colored with "r, g, b"
// "text" is what is drawn on the button, which might be a multi-byte unicode string.
// "command" is a single-char id for the button.
static void
_button_add(Efl_Ui_Table *table, const char *text, const char *command, int posx, int posy, int r, int g, int b)
{
@ -127,11 +142,13 @@ _button_add(Efl_Ui_Table *table, const char *text, const char *command, int posx
efl_content_set(button, label);
}
// Creates the UI
static void
_gui_setup()
{
Eo *win, *table;
// The window
win = efl_add(EFL_UI_WIN_CLASS, efl_main_loop_get(),
efl_ui_win_type_set(efl_added, EFL_UI_WIN_TYPE_BASIC),
efl_text_set(efl_added, "EFL Calculator"),
@ -140,11 +157,13 @@ _gui_setup()
// when the user clicks "close" on a window there is a request to delete
efl_event_callback_add(win, EFL_UI_WIN_EVENT_DELETE_REQUEST, _gui_quit_cb, NULL);
// The table is the main layout
table = efl_add(EFL_UI_TABLE_CLASS, win,
efl_content_set(win, efl_added),
efl_pack_table_size_set(efl_added, 4, 5),
efl_gfx_hint_size_min_set(efl_added, EINA_SIZE2D(300, 400)));
// Create all buttons using the _button_add helper
_button_add(table, "1", "1", 0, 3, 255, 255, 255);
_button_add(table, "2", "2", 1, 3, 255, 255, 255);
_button_add(table, "3", "3", 2, 3, 255, 255, 255);
@ -162,6 +181,7 @@ _gui_setup()
_button_add(table, "=", "=", 2, 4, 128, 128, 128);
_button_add(table, "C", "C", 0, 4, 0, 0, 0);
// Create a big Efl.Ui.Text screen to display the current input
_screen = efl_add(EFL_UI_TEXT_CLASS, table,
efl_text_set(efl_added, "0"),
efl_text_multiline_set(efl_added, EINA_FALSE),

36
apps/csharp/calculator/src/calculator.cs
View File

@ -1,12 +1,15 @@
/* Simple calculator using an Efl.Ui.Table to place the buttons
*/
using System;
public class Calculator : Efl.Csharp.Application
{
private Efl.Ui.Text screen;
private int prevValue = 0;
private int currValue = 0;
private char operation = '=';
private bool mustOverwrite = false;
private Efl.Ui.Text screen; // Text widget showing current value
private int prevValue = 0; // Value introduced before an operation (first operand)
private int currValue = 0; // Value currently being introduced (second operand)
private char operation = '='; // Last operation button pressed
private bool mustOverwrite = false; // Whether next number must be appended to current input
// or overwrite it
// Quits the application
private void GUIQuitCb(object sender, Efl.Gfx.EntityVisibilityChangedEventArgs ea)
@ -15,6 +18,7 @@ public class Calculator : Efl.Csharp.Application
Efl.App.AppMain.Quit(0);
}
// Performs "operation" on "currValue" and "prevValue" and leaves result in "currValue"
private void Operate()
{
switch (operation)
@ -36,8 +40,10 @@ public class Calculator : Efl.Csharp.Application
}
}
// Called every time a button is pressed
private void ButtonPressedCb(char button)
{
// If it is a number, append it to current input (or replace it)
if (button >= '0' && button <= '9')
{
if (mustOverwrite)
@ -52,6 +58,7 @@ public class Calculator : Efl.Csharp.Application
switch (button)
{
case 'C':
// Clear current input
screen.SetText("0");
break;
case '+':
@ -59,11 +66,13 @@ public class Calculator : Efl.Csharp.Application
case '*':
case '/':
case '=':
// If there was a pending operation, perform it
if (operation != '=')
{
Operate();
screen.SetText(currValue.ToString());
}
// Store this operation
operation = button;
mustOverwrite = true;
prevValue = currValue;
@ -74,6 +83,10 @@ public class Calculator : Efl.Csharp.Application
}
}
// Called every time the content of the screen changes
// We use it to sanitize input (remove heading zeros, for example)
// This makes more sense when the Text widget is editable, since the user
// is free to type anything.
private void ScreenChangedCb(object sender, EventArgs ea)
{
string text = "";
@ -96,8 +109,10 @@ public class Calculator : Efl.Csharp.Application
if (text != str) screen.SetText(text);
}
// text is what is drawn on the button, which might be a multi-byte unicode string.
// command is a single-char id for the button.
// Creates an Efl.Ui.Button and positions it in the given position inside the table
// The button text is colored with "r, g, b"
// "text" is what is drawn on the button, which might be a multi-byte unicode string.
// "command" is a single-char id for the button.
private void AddButton(Efl.Ui.Table table, string text, char command, int posx, int posy, int r, int g, int b)
{
var button = new Efl.Ui.Button(table);
@ -107,7 +122,7 @@ public class Calculator : Efl.Csharp.Application
};
// Buttons can only have simple text (no font, styles or markup) but can swallow
// any other object we want.
// Therefore we create a more complex Efl_Ui_Text object and use it as content for the button.
// Therefore we create a more complex Efl.Ui.Text object and use it as content for the button.
var label = new Efl.Ui.Text(table);
label.Editable = false;
label.Halign = 0.5;
@ -118,18 +133,22 @@ public class Calculator : Efl.Csharp.Application
button.Content = label;
}
// Called on start up. We use it to create the UI.
protected override void OnInitialize(string[] args)
{
// The window
var win = new Efl.Ui.Win(Efl.App.AppMain);
win.SetText("EFL Calculator");
win.Autohide = true;
win.VisibilityChangedEvent += GUIQuitCb;
// The table is the main layout
var table = new Efl.Ui.Table(win);
win.Content = table;
table.TableSize = (4, 5);
table.HintSizeMin = new Eina.Size2D(300, 400);
// Create all buttons using the AddButton helper
AddButton(table, "1", '1', 0, 3, 255, 255, 255);
AddButton(table, "2", '2', 1, 3, 255, 255, 255);
AddButton(table, "3", '3', 2, 3, 255, 255, 255);
@ -147,6 +166,7 @@ public class Calculator : Efl.Csharp.Application
AddButton(table, "=", '=', 2, 4, 128, 128, 128);
AddButton(table, "C", 'C', 0, 4, 0, 0, 0);
// Create a big Efl.Ui.Text screen to display the current input
screen = new Efl.Ui.Text(table);
screen.SetText("0");
screen.Font = ("Sans", (Efl.Font.Size)48);