dom/html/nsIFormControl.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6 #ifndef nsIFormControl_h___
   7 #define nsIFormControl_h___
   8
   9 #include "mozilla/EventForwards.h"
  10 #include "mozilla/StaticPrefs_dom.h"
  11 #include "nsISupports.h"
  12
  13 namespace mozilla {
  14 class PresState;
  15 namespace dom {
  16 class Element;
  17 class FormData;
  18 class HTMLFieldSetElement;
  19 class HTMLFormElement;
  20 }  // namespace dom
  21 }  // namespace mozilla
  22
  23 // Elements with different types, the value is used as a mask.
  24 // When changing the order, adding or removing elements, be sure to update
  25 // the static_assert checks accordingly.
  26 constexpr uint8_t kFormControlButtonElementMask = 0x40;  // 0b01000000
  27 constexpr uint8_t kFormControlInputElementMask = 0x80;   // 0b10000000
  28
  29 enum class FormControlType : uint8_t {
  30   Fieldset = 1,
  31   Output,
  32   Select,
  33   Textarea,
  34   Object,
  35   FormAssociatedCustomElement,
  36
  37   LastWithoutSubtypes = FormAssociatedCustomElement,
  38
  39   ButtonButton = kFormControlButtonElementMask + 1,
  40   ButtonReset,
  41   ButtonSubmit,
  42   LastButtonElement = ButtonSubmit,
  43
  44   InputButton = kFormControlInputElementMask + 1,
  45   InputCheckbox,
  46   InputColor,
  47   InputDate,
  48   InputEmail,
  49   InputFile,
  50   InputHidden,
  51   InputReset,
  52   InputImage,
  53   InputMonth,
  54   InputNumber,
  55   InputPassword,
  56   InputRadio,
  57   InputSearch,
  58   InputSubmit,
  59   InputTel,
  60   InputText,
  61   InputTime,
  62   InputUrl,
  63   InputRange,
  64   InputWeek,
  65   InputDatetimeLocal,
  66   LastInputElement = InputDatetimeLocal,
  67 };
  68
  69 static_assert(uint8_t(FormControlType::LastWithoutSubtypes) <
  70                   kFormControlButtonElementMask,
  71               "Too many FormControlsTypes without sub-types");
  72 static_assert(uint8_t(FormControlType::LastButtonElement) <
  73                   kFormControlInputElementMask,
  74               "Too many ButtonElementTypes");
  75 static_assert(uint32_t(FormControlType::LastInputElement) < (1 << 8),
  76               "Too many form control types");
  77
  78 #define NS_IFORMCONTROL_IID                          \
  79   {                                                  \
  80     0x4b89980c, 0x4dcd, 0x428f, {                    \
  81       0xb7, 0xad, 0x43, 0x5b, 0x93, 0x29, 0x79, 0xec \
  82     }                                                \
  83   }
  84
  85 /**
  86  * Interface which all form controls (e.g. buttons, checkboxes, text,
  87  * radio buttons, select, etc) implement in addition to their dom specific
  88  * interface.
  89  */
  90 class nsIFormControl : public nsISupports {
  91  public:
  92   nsIFormControl(FormControlType aType) : mType(aType) {}
  93
  94   NS_DECLARE_STATIC_IID_ACCESSOR(NS_IFORMCONTROL_IID)
  95
  96   /**
  97    * Get the fieldset for this form control.
  98    * @return the fieldset
  99    */
 100   virtual mozilla::dom::HTMLFieldSetElement* GetFieldSet() = 0;
 101
 102   /**
 103    * Get the form for this form control.
 104    * @return the form
 105    */
 106   virtual mozilla::dom::HTMLFormElement* GetForm() const = 0;
 107
 108   /**
 109    * Set the form for this form control.
 110    * @param aForm the form.  This must not be null.
 111    *
 112    * @note that when setting the form the control is not added to the
 113    * form.  It adds itself when it gets bound to the tree thereafter,
 114    * so that it can be properly sorted with the other controls in the
 115    * form.
 116    */
 117   virtual void SetForm(mozilla::dom::HTMLFormElement* aForm) = 0;
 118
 119   /**
 120    * Tell the control to forget about its form.
 121    *
 122    * @param aRemoveFromForm set false if you do not want this element removed
 123    *        from the form.  (Used by nsFormControlList::Clear())
 124    * @param aUnbindOrDelete set true if the element is being deleted or unbound
 125    *        from tree.
 126    */
 127   virtual void ClearForm(bool aRemoveFromForm, bool aUnbindOrDelete) = 0;
 128
 129   /**
 130    * Get the type of this control as an int (see NS_FORM_* above)
 131    * @return the type of this control
 132    */
 133   FormControlType ControlType() const { return mType; }
 134
 135   /**
 136    * Reset this form control (as it should be when the user clicks the Reset
 137    * button)
 138    */
 139   NS_IMETHOD Reset() = 0;
 140
 141   /**
 142    * Tells the form control to submit its names and values to the form data
 143    * object
 144    *
 145    * @param aFormData the form data to notify of names/values/files to submit
 146    */
 147   NS_IMETHOD
 148   SubmitNamesValues(mozilla::dom::FormData* aFormData) = 0;
 149
 150   virtual bool AllowDrop() = 0;
 151
 152   /**
 153    * Returns whether this is a control which submits the form when activated by
 154    * the user.
 155    * @return whether this is a submit control.
 156    */
 157   inline bool IsSubmitControl() const;
 158
 159   /**
 160    * Returns whether this is a text control.
 161    * @param  aExcludePassword  to have NS_FORM_INPUT_PASSWORD returning false.
 162    * @return whether this is a text control.
 163    */
 164   inline bool IsTextControl(bool aExcludePassword) const;
 165
 166   /**
 167    * Returns whether this is a single line text control.
 168    * @param  aExcludePassword  to have NS_FORM_INPUT_PASSWORD returning false.
 169    * @return whether this is a single line text control.
 170    */
 171   inline bool IsSingleLineTextControl(bool aExcludePassword) const;
 172
 173   /**
 174    * Returns whether this is a submittable form control.
 175    * @return whether this is a submittable form control.
 176    */
 177   inline bool IsSubmittableControl() const;
 178
 179   /**
 180    * https://html.spec.whatwg.org/multipage/forms.html#concept-button
 181    */
 182   inline bool IsConceptButton() const;
 183
 184   /**
 185    * Returns whether this is an ordinal button or a concept button that has no
 186    * form associated.
 187    */
 188   inline bool IsButtonControl() const;
 189
 190   /**
 191    * Returns whether this form control can have draggable children.
 192    * @return whether this form control can have draggable children.
 193    */
 194   inline bool AllowDraggableChildren() const;
 195
 196   // Returns a number for this form control that is unique within its
 197   // owner document.  This is used by nsContentUtils::GenerateStateKey
 198   // to identify form controls that are inserted into the document by
 199   // the parser.  -1 is returned for form controls with no state or
 200   // which were inserted into the document by some other means than
 201   // the parser from the network.
 202   virtual int32_t GetParserInsertedControlNumberForStateKey() const {
 203     return -1;
 204   };
 205
 206  protected:
 207   /**
 208    * Returns whether mType corresponds to a single line text control type.
 209    * @param aExcludePassword to have NS_FORM_INPUT_PASSWORD ignored.
 210    * @param aType the type to be tested.
 211    * @return whether mType corresponds to a single line text control type.
 212    */
 213   inline static bool IsSingleLineTextControl(bool aExcludePassword,
 214                                              FormControlType);
 215
 216   inline static bool IsButtonElement(FormControlType aType) {
 217     return uint8_t(aType) & kFormControlButtonElementMask;
 218   }
 219
 220   inline static bool IsInputElement(FormControlType aType) {
 221     return uint8_t(aType) & kFormControlInputElementMask;
 222   }
 223
 224   FormControlType mType;
 225 };
 226
 227 bool nsIFormControl::IsSubmitControl() const {
 228   FormControlType type = ControlType();
 229   return type == FormControlType::InputSubmit ||
 230          type == FormControlType::InputImage ||
 231          type == FormControlType::ButtonSubmit;
 232 }
 233
 234 bool nsIFormControl::IsTextControl(bool aExcludePassword) const {
 235   FormControlType type = ControlType();
 236   return type == FormControlType::Textarea ||
 237          IsSingleLineTextControl(aExcludePassword, type);
 238 }
 239
 240 bool nsIFormControl::IsSingleLineTextControl(bool aExcludePassword) const {
 241   return IsSingleLineTextControl(aExcludePassword, ControlType());
 242 }
 243
 244 /*static*/
 245 bool nsIFormControl::IsSingleLineTextControl(bool aExcludePassword,
 246                                              FormControlType aType) {
 247   switch (aType) {
 248     case FormControlType::InputText:
 249     case FormControlType::InputEmail:
 250     case FormControlType::InputSearch:
 251     case FormControlType::InputTel:
 252     case FormControlType::InputUrl:
 253     case FormControlType::InputNumber:
 254     // TODO: those are temporary until bug 773205 is fixed.
 255     case FormControlType::InputMonth:
 256     case FormControlType::InputWeek:
 257       return true;
 258     case FormControlType::InputPassword:
 259       return !aExcludePassword;
 260     default:
 261       return false;
 262   }
 263 }
 264
 265 bool nsIFormControl::IsSubmittableControl() const {
 266   auto type = ControlType();
 267   return type == FormControlType::Object || type == FormControlType::Textarea ||
 268          type == FormControlType::Select || IsButtonElement(type) ||
 269          IsInputElement(type);
 270 }
 271
 272 bool nsIFormControl::IsConceptButton() const {
 273   auto type = ControlType();
 274   return IsSubmitControl() || type == FormControlType::InputReset ||
 275          type == FormControlType::InputButton || IsButtonElement(type);
 276 }
 277
 278 bool nsIFormControl::IsButtonControl() const {
 279   return IsConceptButton() && (!GetForm() || !IsSubmitControl());
 280 }
 281
 282 bool nsIFormControl::AllowDraggableChildren() const {
 283   auto type = ControlType();
 284   return type == FormControlType::Object || type == FormControlType::Fieldset ||
 285          type == FormControlType::Output;
 286 }
 287
 288 NS_DEFINE_STATIC_IID_ACCESSOR(nsIFormControl, NS_IFORMCONTROL_IID)
 289
 290 #endif /* nsIFormControl_h___ */